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     "height": 20,
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     "values": [
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    },
    {
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAASUlEQVQ4jWNhOPHfmOEfgzEDNQATw1kWqGFpVDHwH8MsFgYqA5ZRAykGLJQbgQpGDaQcsFDBDBQwauDICEMmhrOgkpYqpgHNAgBEtQqwvG/6+QAAAABJRU5ErkJggg==",
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    },
    {
     "label": "<all other values>",
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     "contentType": "image/png",
     "groupId": "1",
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   ],
   "legendGroups": [
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     "heading": "Aquifer"
    },
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   ]
  }
 ]
}