{
 "layers": [
  {
   "layerId": 0,
   "layerName": "Signals",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "54ce93b55ea8390636980ae641b88daa",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAhklEQVQ4je3QzQ2AIAwF4Hfw6gIe1EVI2Ky4WRMWKRxYoAt4QWNiRPw58hJCIM1HaYef0zWwgXtc3jmvT6AbrCEAUImkEpbDA49B288TDdbsF4k9Jfa4QivA8abkGXiKSgQKc7wDXWIPlUhbp3mGr0EAcCqBVYLdzqXi2i9zqas3YHUa+D0rTukpiKG8vnEAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": ""
    }
   ]
  }
 ]
}