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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAR0lEQVQ4jWPJy83ezvD/vwMDNQAj4wEWhv//HQR3z+KghnnvXdMcWKhhEDIYNXDUwFEDRw0cNRBmICPjgfeuaQ5UMY2R8QAArwoOMqBY11UAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "10"
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Health Hazard Index (HHI)"
    }
   ]
  }
 ]
}