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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBh4Js/lNikN26I4woBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAABD1AYC/DsVxAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Resistividad (ohm.m)"
    }
   ]
  }
 ]
}