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     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "pC Precambrian undifferentiated",
     "url": "6405869a90ac9c83769c1517f1c7bd43",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOklEQVQ4jWN5cLj3PwOVgIJtMSMLA5UBy6iBFAMWyo1ABaMGUg5YqGAGChg1kHLAMgINVLAtZqSmiQBZwAUiluxGjgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
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   ]
  }
 ]
}