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     "contentType": "image/png",
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     "height": 20,
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     "values": [
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    },
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     "label": "78.6",
     "url": "0a112768b83e7561d1ec17cba517c663",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAPklEQVQ4jWOZ/vi/AwMDAwhTAxxggRpWTyUDGUAGUhWwjBpIMWCh3AhUMGog5YCFCmaggFEDR0oYHqCieQcADe4GSYc1uQQAAAAASUVORK5CYII=",
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     "groupId": "0",
     "height": 20,
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     "values": [
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    },
    {
     "label": "<all other values>",
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     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "amTemperature"
    },
    {
     "id": "1",
     "heading": ""
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   ]
  }
 ]
}