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     "url": "af451f208135ad4670c52b503f497c94",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB////b6DEIEZGxgYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgDbfQTU35h8/QAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "220",
     "url": "af451f208135ad4670c52b503f497c94",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB////b6DEIEZGxgYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgDbfQTU35h8/QAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Change in elevation (ft)"
    }
   ]
  },
  {
   "layerId": 11,
   "layerName": "Difference grid hill shade",
   "layerType": "Raster Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "High : 254 - Low : 0",
     "url": "f4e762c2f876d4e5c95b3dcafbff81e0",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAA8CAYAAABmdppWAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAVklEQVRYhe3RsQ0AMAgDQQr2XxhEMgQukN4Z4IUvOTMvhC+7W9mLrCptUH7h/SDQEDjZhgeDNtwHgYbAyTbcB+WTgYb3P8WTCUEb7oM23AeBhsDJPMMPhDiy8wP+5V4AAAAASUVORK5CYII=",
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     "height": 60,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Value"
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   ]
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}