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     "width": 20,
     "values": [
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    },
    {
     "label": "> 500",
     "url": "7c8766d0791c7ecb5b633264571e7204",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAL0lEQVQ4jWNhYGBwgGJqgAMsUMPqqWQgAwu1DBo1cNTAUQNHDRw1ENPAA1Q07wAAbKQD0P1WRYgAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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    }
   ],
   "legendGroups": [
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     "id": "0",
     "heading": "gridcode"
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  }
 ]
}