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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPUlEQVQ4je3QIRIAIAwDQUTee30LfBiGQVU3jp6IXBEBexjTnbmWBQt4oDM1WE51ItdgPRmMVIPffBhgEw98UQblSHF8TwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      2013
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "res_year_built"
    }
   ]
  }
 ]
}