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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATElEQVQ4je3UsRHAIBADwQtUCKW4W9qgFBfyg5nPTIwy/grYQIHUP5qgYSjgVWITHgcoGHJA/wo8TwZjq8DzZDC2Crxiw8jbhuHA0lrR3gq5lBx8CgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "50"
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Niveau sonore Ln (min)"
    }
   ]
  }
 ]
}