{
 "layers": [
  {
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   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "Carbonate",
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     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "<all other values>",
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   ],
   "legendGroups": [
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     "heading": "Carbonate Level"
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}