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    {
     "label": "20 - 25",
     "url": "231bbaf6154b0f8e42045c2a258ad1fa",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB//8z/KfEIEZGBkYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgAJMQNUcB1RQwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "25 - 30",
     "url": "a2dd4291787d454c1e3db6a17e4e1f5e",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB/88w/KfEIEYTBkYUA6kFRg0cNXDUwFED6WwgrDyjmoHUAgAauQOHSZSytQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "> 30 (VLI OPair)",
     "url": "41a0cf5fc27c7a578f77987692c27a77",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAMUlEQVQ4jWNhoDJgoZmB/xkY/lNiECMDAyOKgdQCowaOGjhq4KiBdDYQVp5RzUBqAQBgfwJTXu298gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Concentration en µg/m³"
    }
   ]
  }
 ]
}