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     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "RouteID"
    },
    {
     "id": "1",
     "heading": ""
    }
   ]
  }
 ]
}