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     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "Major Arterial",
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     "height": 20,
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     "values": [
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    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Road Class"
    }
   ]
  }
 ]
}