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