diff --git a/examples/notebooks/demo_network.ipynb b/examples/notebooks/demo_network.ipynb
index b1f5f1e..6332b7b 100644
--- a/examples/notebooks/demo_network.ipynb
+++ b/examples/notebooks/demo_network.ipynb
@@ -407,7 +407,7 @@
        "    complex    (space, time) complex64 6MB dask.array<chunksize=(1000, 10), meta=np.ndarray>\n",
        "    phase      (space, time) float32 3MB dask.array<chunksize=(1000, 10), meta=np.ndarray>\n",
        "Attributes:\n",
-       "    multi-look:  coarsen-mean</pre><div class='xr-wrap' style='display:none'><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-12b0cf29-c724-4dc5-b16d-d2df066cc73b' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-12b0cf29-c724-4dc5-b16d-d2df066cc73b' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span>space</span>: 78582</li><li><span class='xr-has-index'>time</span>: 10</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-18d30734-bf48-495c-8f9f-c620706f9164' class='xr-section-summary-in' type='checkbox'  checked><label for='section-18d30734-bf48-495c-8f9f-c620706f9164' class='xr-section-summary' >Coordinates: <span>(5)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>azimuth</span></div><div class='xr-var-dims'>(space)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000,), meta=np.ndarray&gt;</div><input id='attrs-d624eed1-0cd3-4986-9189-53fdac1f512a' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-d624eed1-0cd3-4986-9189-53fdac1f512a' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-6a065507-588d-4c62-a799-fd849190620a' class='xr-var-data-in' type='checkbox'><label for='data-6a065507-588d-4c62-a799-fd849190620a' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
+       "    multi-look:  coarsen-mean</pre><div class='xr-wrap' style='display:none'><div class='xr-header'><div class='xr-obj-type'>xarray.Dataset</div></div><ul class='xr-sections'><li class='xr-section-item'><input id='section-1979d8d0-a84a-483c-b02f-3055efa3ea1e' class='xr-section-summary-in' type='checkbox' disabled ><label for='section-1979d8d0-a84a-483c-b02f-3055efa3ea1e' class='xr-section-summary'  title='Expand/collapse section'>Dimensions:</label><div class='xr-section-inline-details'><ul class='xr-dim-list'><li><span>space</span>: 78582</li><li><span class='xr-has-index'>time</span>: 10</li></ul></div><div class='xr-section-details'></div></li><li class='xr-section-item'><input id='section-4685e55c-8994-4fdc-bb62-e44d86a8bda6' class='xr-section-summary-in' type='checkbox'  checked><label for='section-4685e55c-8994-4fdc-bb62-e44d86a8bda6' class='xr-section-summary' >Coordinates: <span>(5)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>azimuth</span></div><div class='xr-var-dims'>(space)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000,), meta=np.ndarray&gt;</div><input id='attrs-0bbfa73f-8c0a-461a-b872-ea820575507c' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-0bbfa73f-8c0a-461a-b872-ea820575507c' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-20a13906-9214-4088-98f9-6385d7b35946' class='xr-var-data-in' type='checkbox'><label for='data-20a13906-9214-4088-98f9-6385d7b35946' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
        "    <tr>\n",
        "        <td>\n",
        "            <table style=\"border-collapse: collapse;\">\n",
@@ -480,7 +480,7 @@
        "</svg>\n",
        "        </td>\n",
        "    </tr>\n",
-       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(space)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000,), meta=np.ndarray&gt;</div><input id='attrs-8fcae20a-c56c-4f2e-8ebd-a0fa62f9d3e9' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-8fcae20a-c56c-4f2e-8ebd-a0fa62f9d3e9' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-f4391c41-b6a5-4b91-98df-c4316a16a356' class='xr-var-data-in' type='checkbox'><label for='data-f4391c41-b6a5-4b91-98df-c4316a16a356' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
+       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lat</span></div><div class='xr-var-dims'>(space)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000,), meta=np.ndarray&gt;</div><input id='attrs-dd5f9f98-ac47-40c3-935c-a2375edfb658' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-dd5f9f98-ac47-40c3-935c-a2375edfb658' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-38c5ea9f-b029-460e-a4fa-ca6032e5e811' class='xr-var-data-in' type='checkbox'><label for='data-38c5ea9f-b029-460e-a4fa-ca6032e5e811' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
        "    <tr>\n",
        "        <td>\n",
        "            <table style=\"border-collapse: collapse;\">\n",
@@ -553,7 +553,7 @@
        "</svg>\n",
        "        </td>\n",
        "    </tr>\n",
-       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(space)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000,), meta=np.ndarray&gt;</div><input id='attrs-c72ce6c9-01d5-46d3-b0e0-2036dec2f8c9' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-c72ce6c9-01d5-46d3-b0e0-2036dec2f8c9' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-34e3f8b4-68bb-4256-853f-c16ec39e0aba' class='xr-var-data-in' type='checkbox'><label for='data-34e3f8b4-68bb-4256-853f-c16ec39e0aba' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
+       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>lon</span></div><div class='xr-var-dims'>(space)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000,), meta=np.ndarray&gt;</div><input id='attrs-da8961f1-05ff-4e57-83e1-ae200dac51cd' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-da8961f1-05ff-4e57-83e1-ae200dac51cd' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-006e26cc-a602-4ea4-a612-e7c2653b2137' class='xr-var-data-in' type='checkbox'><label for='data-006e26cc-a602-4ea4-a612-e7c2653b2137' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
        "    <tr>\n",
        "        <td>\n",
        "            <table style=\"border-collapse: collapse;\">\n",
@@ -626,7 +626,7 @@
        "</svg>\n",
        "        </td>\n",
        "    </tr>\n",
-       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>range</span></div><div class='xr-var-dims'>(space)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000,), meta=np.ndarray&gt;</div><input id='attrs-efa098de-f841-4161-8f52-b64ec1c0061c' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-efa098de-f841-4161-8f52-b64ec1c0061c' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-a0801cc4-9bff-4bce-9552-8927552abdb0' class='xr-var-data-in' type='checkbox'><label for='data-a0801cc4-9bff-4bce-9552-8927552abdb0' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
+       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>range</span></div><div class='xr-var-dims'>(space)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000,), meta=np.ndarray&gt;</div><input id='attrs-d037fb69-c107-43b3-a25b-a09995fd89d9' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-d037fb69-c107-43b3-a25b-a09995fd89d9' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-1a284235-4ad5-4465-8ef7-bf7cd37a0b76' class='xr-var-data-in' type='checkbox'><label for='data-1a284235-4ad5-4465-8ef7-bf7cd37a0b76' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
        "    <tr>\n",
        "        <td>\n",
        "            <table style=\"border-collapse: collapse;\">\n",
@@ -699,7 +699,7 @@
        "</svg>\n",
        "        </td>\n",
        "    </tr>\n",
-       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>0 1 2 3 4 5 6 7 8 9</div><input id='attrs-16aff9fd-eaca-44c0-b34f-8d5a18f4ebf5' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-16aff9fd-eaca-44c0-b34f-8d5a18f4ebf5' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-4c4ed6a1-a501-470a-b1dd-fad682df0c2a' class='xr-var-data-in' type='checkbox'><label for='data-4c4ed6a1-a501-470a-b1dd-fad682df0c2a' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-16cb7285-89c3-44c8-b073-b94542bed623' class='xr-section-summary-in' type='checkbox'  checked><label for='section-16cb7285-89c3-44c8-b073-b94542bed623' class='xr-section-summary' >Data variables: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>amplitude</span></div><div class='xr-var-dims'>(space, time)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000, 10), meta=np.ndarray&gt;</div><input id='attrs-fccb78cf-cece-452e-a156-e33f50330138' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-fccb78cf-cece-452e-a156-e33f50330138' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-f5d38995-3219-4bb4-86f9-623db263ed8a' class='xr-var-data-in' type='checkbox'><label for='data-f5d38995-3219-4bb4-86f9-623db263ed8a' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
+       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>time</span></div><div class='xr-var-dims'>(time)</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>0 1 2 3 4 5 6 7 8 9</div><input id='attrs-93e49cc2-74d6-42ce-aec0-19d56bc63784' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-93e49cc2-74d6-42ce-aec0-19d56bc63784' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-afa23ab9-fff5-4236-a517-5450f314bd42' class='xr-var-data-in' type='checkbox'><label for='data-afa23ab9-fff5-4236-a517-5450f314bd42' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-d9d8efdc-d6eb-41c7-9f37-cd16bfb5772a' class='xr-section-summary-in' type='checkbox'  checked><label for='section-d9d8efdc-d6eb-41c7-9f37-cd16bfb5772a' class='xr-section-summary' >Data variables: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>amplitude</span></div><div class='xr-var-dims'>(space, time)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000, 10), meta=np.ndarray&gt;</div><input id='attrs-74cf4bd4-fab3-4db5-8d23-13c179a68538' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-74cf4bd4-fab3-4db5-8d23-13c179a68538' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-b49885c1-d090-48bc-99bc-8f004d31d5d2' class='xr-var-data-in' type='checkbox'><label for='data-b49885c1-d090-48bc-99bc-8f004d31d5d2' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
        "    <tr>\n",
        "        <td>\n",
        "            <table style=\"border-collapse: collapse;\">\n",
@@ -772,7 +772,7 @@
        "</svg>\n",
        "        </td>\n",
        "    </tr>\n",
-       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>complex</span></div><div class='xr-var-dims'>(space, time)</div><div class='xr-var-dtype'>complex64</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000, 10), meta=np.ndarray&gt;</div><input id='attrs-3c21cfcc-b63d-40c5-a5bd-3e2d243dc47d' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-3c21cfcc-b63d-40c5-a5bd-3e2d243dc47d' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-dde98397-cf46-4d44-8fb4-8d7d5ec160b4' class='xr-var-data-in' type='checkbox'><label for='data-dde98397-cf46-4d44-8fb4-8d7d5ec160b4' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
+       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>complex</span></div><div class='xr-var-dims'>(space, time)</div><div class='xr-var-dtype'>complex64</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000, 10), meta=np.ndarray&gt;</div><input id='attrs-49b51f29-06e9-49b8-afb1-eef3056635c3' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-49b51f29-06e9-49b8-afb1-eef3056635c3' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-58fc81bf-9b0b-455c-b865-eceb007dc25b' class='xr-var-data-in' type='checkbox'><label for='data-58fc81bf-9b0b-455c-b865-eceb007dc25b' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
        "    <tr>\n",
        "        <td>\n",
        "            <table style=\"border-collapse: collapse;\">\n",
@@ -845,7 +845,7 @@
        "</svg>\n",
        "        </td>\n",
        "    </tr>\n",
-       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>phase</span></div><div class='xr-var-dims'>(space, time)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000, 10), meta=np.ndarray&gt;</div><input id='attrs-3de0501d-da50-41c4-8713-6eecc4ea6e0a' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-3de0501d-da50-41c4-8713-6eecc4ea6e0a' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-973d45b7-2601-4525-8b07-f04773c9d3b8' class='xr-var-data-in' type='checkbox'><label for='data-973d45b7-2601-4525-8b07-f04773c9d3b8' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
+       "</table></div></li><li class='xr-var-item'><div class='xr-var-name'><span>phase</span></div><div class='xr-var-dims'>(space, time)</div><div class='xr-var-dtype'>float32</div><div class='xr-var-preview xr-preview'>dask.array&lt;chunksize=(1000, 10), meta=np.ndarray&gt;</div><input id='attrs-cf9e250d-89e3-4901-81ed-8853f1be16ae' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-cf9e250d-89e3-4901-81ed-8853f1be16ae' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-be26ba97-788d-429c-be59-f410f97ed62b' class='xr-var-data-in' type='checkbox'><label for='data-be26ba97-788d-429c-be59-f410f97ed62b' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><table>\n",
        "    <tr>\n",
        "        <td>\n",
        "            <table style=\"border-collapse: collapse;\">\n",
@@ -918,7 +918,7 @@
        "</svg>\n",
        "        </td>\n",
        "    </tr>\n",
-       "</table></div></li></ul></div></li><li class='xr-section-item'><input id='section-0c5466f9-90a5-4a4f-89b3-b9396190b7c5' class='xr-section-summary-in' type='checkbox'  ><label for='section-0c5466f9-90a5-4a4f-89b3-b9396190b7c5' class='xr-section-summary' >Indexes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-index-name'><div>time</div></div><div class='xr-index-preview'>PandasIndex</div><div></div><input id='index-f1f77811-a60a-4004-bb33-ab3c8f731f08' class='xr-index-data-in' type='checkbox'/><label for='index-f1f77811-a60a-4004-bb33-ab3c8f731f08' title='Show/Hide index repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-index-data'><pre>PandasIndex(Index([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], dtype=&#x27;int64&#x27;, name=&#x27;time&#x27;))</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-f9fcff1d-a2d0-4cb5-8274-14ccd2f78347' class='xr-section-summary-in' type='checkbox'  checked><label for='section-f9fcff1d-a2d0-4cb5-8274-14ccd2f78347' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>multi-look :</span></dt><dd>coarsen-mean</dd></dl></div></li></ul></div></div>"
+       "</table></div></li></ul></div></li><li class='xr-section-item'><input id='section-c72b475a-5708-4038-a935-5fd84c5f1622' class='xr-section-summary-in' type='checkbox'  ><label for='section-c72b475a-5708-4038-a935-5fd84c5f1622' class='xr-section-summary' >Indexes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-index-name'><div>time</div></div><div class='xr-index-preview'>PandasIndex</div><div></div><input id='index-10a7d0a8-facf-47c8-bab6-97cc57bc9c6b' class='xr-index-data-in' type='checkbox'/><label for='index-10a7d0a8-facf-47c8-bab6-97cc57bc9c6b' title='Show/Hide index repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-index-data'><pre>PandasIndex(Index([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], dtype=&#x27;int64&#x27;, name=&#x27;time&#x27;))</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-aa11c2c7-9099-468e-8a1b-5025b159f6f8' class='xr-section-summary-in' type='checkbox'  checked><label for='section-aa11c2c7-9099-468e-8a1b-5025b159f6f8' class='xr-section-summary' >Attributes: <span>(1)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>multi-look :</span></dt><dd>coarsen-mean</dd></dl></div></li></ul></div></div>"
       ],
       "text/plain": [
        "<xarray.Dataset> Size: 14MB\n",
@@ -997,7 +997,7 @@
     {
      "data": {
       "text/plain": [
-       "<matplotlib.collections.PathCollection at 0x7f054d9dfe30>"
+       "<matplotlib.collections.PathCollection at 0x7ff11dc7fad0>"
       ]
      },
      "execution_count": 6,
@@ -1093,7 +1093,7 @@
    "source": [
     "# Generate a 'redundant' network with long edges removed.\n",
     "# A redundant network tries to create min_links arcs per node, spread evenly over num_partitions based on orientation.\n",
-    "coordinates, arcs_redundant = generate_arcs(stm_points_sparse, method='redundant', max_length=0.05, min_links = 8, num_partitions = 4)\n",
+    "coordinates, arcs_redundant = generate_arcs(stm_points_sparse, method='redundant', max_length=0.05, min_links=8, num_partitions=4)\n",
     "print(len(coordinates))\n",
     "print(len(arcs_redundant))"
    ]
diff --git a/tests/data/stm_sparse.zarr/.zattrs b/tests/data/stm_sparse.zarr/.zattrs
new file mode 100644
index 0000000..bed8730
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/.zattrs
@@ -0,0 +1,3 @@
+{
+    "multi-look": "coarsen-mean"
+}
\ No newline at end of file
diff --git a/tests/data/stm_sparse.zarr/.zgroup b/tests/data/stm_sparse.zarr/.zgroup
new file mode 100644
index 0000000..3b7daf2
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/.zgroup
@@ -0,0 +1,3 @@
+{
+    "zarr_format": 2
+}
\ No newline at end of file
diff --git a/tests/data/stm_sparse.zarr/.zmetadata b/tests/data/stm_sparse.zarr/.zmetadata
new file mode 100644
index 0000000..1be41e8
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/.zmetadata
@@ -0,0 +1,223 @@
+{
+    "metadata": {
+        ".zattrs": {
+            "multi-look": "coarsen-mean"
+        },
+        ".zgroup": {
+            "zarr_format": 2
+        },
+        "amplitude/.zarray": {
+            "chunks": [
+                2,
+                10
+            ],
+            "compressor": {
+                "blocksize": 0,
+                "clevel": 5,
+                "cname": "lz4",
+                "id": "blosc",
+                "shuffle": 1
+            },
+            "dtype": "<f4",
+            "fill_value": "NaN",
+            "filters": null,
+            "order": "C",
+            "shape": [
+                156,
+                10
+            ],
+            "zarr_format": 2
+        },
+        "amplitude/.zattrs": {
+            "_ARRAY_DIMENSIONS": [
+                "space",
+                "time"
+            ],
+            "coordinates": "azimuth lat lon range"
+        },
+        "azimuth/.zarray": {
+            "chunks": [
+                2
+            ],
+            "compressor": {
+                "blocksize": 0,
+                "clevel": 5,
+                "cname": "lz4",
+                "id": "blosc",
+                "shuffle": 1
+            },
+            "dtype": "<i8",
+            "fill_value": null,
+            "filters": null,
+            "order": "C",
+            "shape": [
+                156
+            ],
+            "zarr_format": 2
+        },
+        "azimuth/.zattrs": {
+            "_ARRAY_DIMENSIONS": [
+                "space"
+            ]
+        },
+        "complex/.zarray": {
+            "chunks": [
+                2,
+                10
+            ],
+            "compressor": {
+                "blocksize": 0,
+                "clevel": 5,
+                "cname": "lz4",
+                "id": "blosc",
+                "shuffle": 1
+            },
+            "dtype": "<c8",
+            "fill_value": null,
+            "filters": null,
+            "order": "C",
+            "shape": [
+                156,
+                10
+            ],
+            "zarr_format": 2
+        },
+        "complex/.zattrs": {
+            "_ARRAY_DIMENSIONS": [
+                "space",
+                "time"
+            ],
+            "coordinates": "azimuth lat lon range"
+        },
+        "lat/.zarray": {
+            "chunks": [
+                2
+            ],
+            "compressor": {
+                "blocksize": 0,
+                "clevel": 5,
+                "cname": "lz4",
+                "id": "blosc",
+                "shuffle": 1
+            },
+            "dtype": "<f4",
+            "fill_value": "NaN",
+            "filters": null,
+            "order": "C",
+            "shape": [
+                156
+            ],
+            "zarr_format": 2
+        },
+        "lat/.zattrs": {
+            "_ARRAY_DIMENSIONS": [
+                "space"
+            ]
+        },
+        "lon/.zarray": {
+            "chunks": [
+                2
+            ],
+            "compressor": {
+                "blocksize": 0,
+                "clevel": 5,
+                "cname": "lz4",
+                "id": "blosc",
+                "shuffle": 1
+            },
+            "dtype": "<f4",
+            "fill_value": "NaN",
+            "filters": null,
+            "order": "C",
+            "shape": [
+                156
+            ],
+            "zarr_format": 2
+        },
+        "lon/.zattrs": {
+            "_ARRAY_DIMENSIONS": [
+                "space"
+            ]
+        },
+        "phase/.zarray": {
+            "chunks": [
+                2,
+                10
+            ],
+            "compressor": {
+                "blocksize": 0,
+                "clevel": 5,
+                "cname": "lz4",
+                "id": "blosc",
+                "shuffle": 1
+            },
+            "dtype": "<f4",
+            "fill_value": "NaN",
+            "filters": null,
+            "order": "C",
+            "shape": [
+                156,
+                10
+            ],
+            "zarr_format": 2
+        },
+        "phase/.zattrs": {
+            "_ARRAY_DIMENSIONS": [
+                "space",
+                "time"
+            ],
+            "coordinates": "azimuth lat lon range"
+        },
+        "range/.zarray": {
+            "chunks": [
+                2
+            ],
+            "compressor": {
+                "blocksize": 0,
+                "clevel": 5,
+                "cname": "lz4",
+                "id": "blosc",
+                "shuffle": 1
+            },
+            "dtype": "<i8",
+            "fill_value": null,
+            "filters": null,
+            "order": "C",
+            "shape": [
+                156
+            ],
+            "zarr_format": 2
+        },
+        "range/.zattrs": {
+            "_ARRAY_DIMENSIONS": [
+                "space"
+            ]
+        },
+        "time/.zarray": {
+            "chunks": [
+                10
+            ],
+            "compressor": {
+                "blocksize": 0,
+                "clevel": 5,
+                "cname": "lz4",
+                "id": "blosc",
+                "shuffle": 1
+            },
+            "dtype": "<i8",
+            "fill_value": null,
+            "filters": null,
+            "order": "C",
+            "shape": [
+                10
+            ],
+            "zarr_format": 2
+        },
+        "time/.zattrs": {
+            "_ARRAY_DIMENSIONS": [
+                "time"
+            ]
+        }
+    },
+    "zarr_consolidated_format": 1
+}
\ No newline at end of file
diff --git a/tests/data/stm_sparse.zarr/amplitude/.zarray b/tests/data/stm_sparse.zarr/amplitude/.zarray
new file mode 100644
index 0000000..f3bc720
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/amplitude/.zarray
@@ -0,0 +1,22 @@
+{
+    "chunks": [
+        2,
+        10
+    ],
+    "compressor": {
+        "blocksize": 0,
+        "clevel": 5,
+        "cname": "lz4",
+        "id": "blosc",
+        "shuffle": 1
+    },
+    "dtype": "<f4",
+    "fill_value": "NaN",
+    "filters": null,
+    "order": "C",
+    "shape": [
+        156,
+        10
+    ],
+    "zarr_format": 2
+}
\ No newline at end of file
diff --git a/tests/data/stm_sparse.zarr/amplitude/.zattrs b/tests/data/stm_sparse.zarr/amplitude/.zattrs
new file mode 100644
index 0000000..6f2f543
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/amplitude/.zattrs
@@ -0,0 +1,7 @@
+{
+    "_ARRAY_DIMENSIONS": [
+        "space",
+        "time"
+    ],
+    "coordinates": "azimuth lat lon range"
+}
\ No newline at end of file
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diff --git a/tests/data/stm_sparse.zarr/azimuth/.zarray b/tests/data/stm_sparse.zarr/azimuth/.zarray
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--- /dev/null
+++ b/tests/data/stm_sparse.zarr/azimuth/.zarray
@@ -0,0 +1,20 @@
+{
+    "chunks": [
+        2
+    ],
+    "compressor": {
+        "blocksize": 0,
+        "clevel": 5,
+        "cname": "lz4",
+        "id": "blosc",
+        "shuffle": 1
+    },
+    "dtype": "<i8",
+    "fill_value": null,
+    "filters": null,
+    "order": "C",
+    "shape": [
+        156
+    ],
+    "zarr_format": 2
+}
\ No newline at end of file
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--- /dev/null
+++ b/tests/data/stm_sparse.zarr/azimuth/.zattrs
@@ -0,0 +1,5 @@
+{
+    "_ARRAY_DIMENSIONS": [
+        "space"
+    ]
+}
\ No newline at end of file
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diff --git a/tests/data/stm_sparse.zarr/complex/.zarray b/tests/data/stm_sparse.zarr/complex/.zarray
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index 0000000..024e68a
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/complex/.zarray
@@ -0,0 +1,22 @@
+{
+    "chunks": [
+        2,
+        10
+    ],
+    "compressor": {
+        "blocksize": 0,
+        "clevel": 5,
+        "cname": "lz4",
+        "id": "blosc",
+        "shuffle": 1
+    },
+    "dtype": "<c8",
+    "fill_value": null,
+    "filters": null,
+    "order": "C",
+    "shape": [
+        156,
+        10
+    ],
+    "zarr_format": 2
+}
\ No newline at end of file
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--- /dev/null
+++ b/tests/data/stm_sparse.zarr/complex/.zattrs
@@ -0,0 +1,7 @@
+{
+    "_ARRAY_DIMENSIONS": [
+        "space",
+        "time"
+    ],
+    "coordinates": "azimuth lat lon range"
+}
\ No newline at end of file
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diff --git a/tests/data/stm_sparse.zarr/lat/.zarray b/tests/data/stm_sparse.zarr/lat/.zarray
new file mode 100644
index 0000000..4bc14cf
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/lat/.zarray
@@ -0,0 +1,20 @@
+{
+    "chunks": [
+        2
+    ],
+    "compressor": {
+        "blocksize": 0,
+        "clevel": 5,
+        "cname": "lz4",
+        "id": "blosc",
+        "shuffle": 1
+    },
+    "dtype": "<f4",
+    "fill_value": "NaN",
+    "filters": null,
+    "order": "C",
+    "shape": [
+        156
+    ],
+    "zarr_format": 2
+}
\ No newline at end of file
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--- /dev/null
+++ b/tests/data/stm_sparse.zarr/lat/.zattrs
@@ -0,0 +1,5 @@
+{
+    "_ARRAY_DIMENSIONS": [
+        "space"
+    ]
+}
\ No newline at end of file
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diff --git a/tests/data/stm_sparse.zarr/lon/.zarray b/tests/data/stm_sparse.zarr/lon/.zarray
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index 0000000..4bc14cf
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/lon/.zarray
@@ -0,0 +1,20 @@
+{
+    "chunks": [
+        2
+    ],
+    "compressor": {
+        "blocksize": 0,
+        "clevel": 5,
+        "cname": "lz4",
+        "id": "blosc",
+        "shuffle": 1
+    },
+    "dtype": "<f4",
+    "fill_value": "NaN",
+    "filters": null,
+    "order": "C",
+    "shape": [
+        156
+    ],
+    "zarr_format": 2
+}
\ No newline at end of file
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index 0000000..a7e8266
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/lon/.zattrs
@@ -0,0 +1,5 @@
+{
+    "_ARRAY_DIMENSIONS": [
+        "space"
+    ]
+}
\ No newline at end of file
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diff --git a/tests/data/stm_sparse.zarr/phase/.zarray b/tests/data/stm_sparse.zarr/phase/.zarray
new file mode 100644
index 0000000..f3bc720
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/phase/.zarray
@@ -0,0 +1,22 @@
+{
+    "chunks": [
+        2,
+        10
+    ],
+    "compressor": {
+        "blocksize": 0,
+        "clevel": 5,
+        "cname": "lz4",
+        "id": "blosc",
+        "shuffle": 1
+    },
+    "dtype": "<f4",
+    "fill_value": "NaN",
+    "filters": null,
+    "order": "C",
+    "shape": [
+        156,
+        10
+    ],
+    "zarr_format": 2
+}
\ No newline at end of file
diff --git a/tests/data/stm_sparse.zarr/phase/.zattrs b/tests/data/stm_sparse.zarr/phase/.zattrs
new file mode 100644
index 0000000..6f2f543
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/phase/.zattrs
@@ -0,0 +1,7 @@
+{
+    "_ARRAY_DIMENSIONS": [
+        "space",
+        "time"
+    ],
+    "coordinates": "azimuth lat lon range"
+}
\ No newline at end of file
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+{
+    "chunks": [
+        2
+    ],
+    "compressor": {
+        "blocksize": 0,
+        "clevel": 5,
+        "cname": "lz4",
+        "id": "blosc",
+        "shuffle": 1
+    },
+    "dtype": "<i8",
+    "fill_value": null,
+    "filters": null,
+    "order": "C",
+    "shape": [
+        156
+    ],
+    "zarr_format": 2
+}
\ No newline at end of file
diff --git a/tests/data/stm_sparse.zarr/range/.zattrs b/tests/data/stm_sparse.zarr/range/.zattrs
new file mode 100644
index 0000000..a7e8266
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/range/.zattrs
@@ -0,0 +1,5 @@
+{
+    "_ARRAY_DIMENSIONS": [
+        "space"
+    ]
+}
\ No newline at end of file
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diff --git a/tests/data/stm_sparse.zarr/time/.zarray b/tests/data/stm_sparse.zarr/time/.zarray
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index 0000000..f24b055
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/time/.zarray
@@ -0,0 +1,20 @@
+{
+    "chunks": [
+        10
+    ],
+    "compressor": {
+        "blocksize": 0,
+        "clevel": 5,
+        "cname": "lz4",
+        "id": "blosc",
+        "shuffle": 1
+    },
+    "dtype": "<i8",
+    "fill_value": null,
+    "filters": null,
+    "order": "C",
+    "shape": [
+        10
+    ],
+    "zarr_format": 2
+}
\ No newline at end of file
diff --git a/tests/data/stm_sparse.zarr/time/.zattrs b/tests/data/stm_sparse.zarr/time/.zattrs
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index 0000000..5a25782
--- /dev/null
+++ b/tests/data/stm_sparse.zarr/time/.zattrs
@@ -0,0 +1,5 @@
+{
+    "_ARRAY_DIMENSIONS": [
+        "time"
+    ]
+}
\ No newline at end of file
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diff --git a/tests/test_network.py b/tests/test_network.py
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--- /dev/null
+++ b/tests/test_network.py
@@ -0,0 +1,39 @@
+"""test_network.py"""
+
+import pytest
+import xarray as xr
+
+from pydepsi.network import generate_arcs
+
+
+@pytest.fixture
+def stm_sparse():
+    # A sparse STM.
+    return xr.open_zarr("tests/data/stm_sparse.zarr")
+
+
+class TestNetwork:
+    def test_generate_arcs_fail(self, stm_sparse):
+        # Test min_links must be strictly positive.
+        result = generate_arcs(stm_sparse, method="redundant", min_links=0)
+        assert result is None
+
+        # Test num_partitions must be strictly positive.
+        result = generate_arcs(stm_sparse, method="redundant", num_partitions=0)
+        assert result is None
+
+    def test_generate_arcs_delaunay(self, stm_sparse):
+        # Generate a Delaunay network with long edges removed.
+        coordinates, arcs = generate_arcs(stm_sparse, method="delaunay", max_length=0.05)
+
+        assert len(coordinates) == 156
+        assert len(arcs) == 442
+
+    def test_generate_arcs_redundant(self, stm_sparse):
+        # Generate a 'redundant' network with long edges removed.
+        coordinates, arcs = generate_arcs(
+            stm_sparse, method="redundant", max_length=0.05, min_links=8, num_partitions=4
+        )
+
+        assert len(coordinates) == 156
+        assert len(arcs) == 797