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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAASElEQVQ4jWNpMNnswMDwz4GBKoDpAAvYsP+M9VQxj/EfAwsDlQHLqIEUAxbKjUAFowZSDlioYAYKGDVwhIQh0wFQSUsdwHQAAIFxCjdJXZbrAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "ultramafic igneous rock",
     "url": "f180879187eed60acc417ff3387adf3c",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAARklEQVQ4jWM5zdDtwMDAAMLUAAdYQIYxMjDWU8O0/wz/GUAGUhWwjBpIMWCh3AhUMGog5YCFCmaggFEDR0oYHgCVtFQCBwDflgkkj4xmeAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Inspire"
    }
   ]
  }
 ]
}