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     "url": "4e4b12a2fa20733c467a204c1d66c9c8",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB/xcI/qfEIMaE94woBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAAAibAWiIgDhUAAAAABJRU5ErkJggg==",
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     "groupId": "0",
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     "label": "≤ 11",
     "url": "542b67dbce4da29ba890d1fef2804ee2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB/yfw/KfEIMaCL4woBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAAApnwW3kHy7CgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
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    },
    {
     "label": "≤ 12",
     "url": "02304bd108ce625a8843adce10634b36",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB/+pF/1NiEFPja0YUA6kFWEYNpBiwUG4EKhg1kHLAQgUzUMCogZQDeBjCyjOqGUgtAAAswQXAi/cWlQAAAABJRU5ErkJggg==",
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     "url": "f549ad244df19413908a8ed01e67e5f5",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB/3Nk/lNiEOOUJ4woBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAAAwjwXLbCV0MAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
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    },
    {
     "label": "≤ 14",
     "url": "bca9dbb94403c59175de70c0f63c835c",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmB/8Jl/lNiENPKJ4woBlILsIwaSDFgodwIVDBqIOWAhQpmoIBRAykH8DCElWdUM5BaAAA4IAXhfFhBagAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "> 14",
     "url": "827dc08a747d4a62da2aa48ccc15bf86",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQElEQVQ4jWNhoDJgoZmBKxha/lNiUARDDSOKgdQCLKMGUgxYKDcCFYwaSDlgoYIZKGDUQMoBPAxh5RnVDKQWAABQPAQm6SdA0QAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "NH3 in µg/m³ "
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   ]
  }
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}