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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQUlEQVQ4jWMpysuZxMDw35iBKoDxLAsDw3/j/G+L2alh3ESuWGMWahiEDEYNHDVw1MBRA0cNhBvIeHYiVyzVqgAA/ecLYoHoRTcAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      40
     ]
    },
    {
     "label": "41 - 50",
     "url": "79b1d35d75543daab6a48eb340b6456e",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAARklEQVQ4jWMpyMuZxPj/nzEDFcB/RqazLIz//xlbnp/JTg0DjxumG7NQwyBkMGrgqIGjBo4aOGog1MD/jExnjxumU60KAACXxhDIRhCHrgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      50
     ]
    },
    {
     "label": "51 - 63",
     "url": "bf4ef62db775f65ef18f62e1bd6a47ac",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQ0lEQVQ4jWPJy8mZxPD/nzEDNQAj01kWhv//jH/unsNODfPYXVOMWahhEDIYNXDUwFEDRw0cNRBmICPTWXbXFKpVAQAaYg0WMdzbMQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      63
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Formal dwelling perc growth between census"
    }
   ]
  }
 ]
}