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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAARElEQVQ4jWNhoDJgGTWQYsBCuRGoYKQaOHv27AZGRkZ7Sgz6////wdTU1AbauDA1NbWBqgZSE7BQ1TSGUQOpAQZ/pAAA/XIKAJaPetwAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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    },
    {
     "label": "G",
     "url": "c029ddec2881f3a0d85da8a7ee15b232",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAcElEQVQ4jWNhoDJgGTWQYsAygg08ffq0A4g2NTU9QLGBp0+fdmBkZNzPwMAAMgxu4NmzZ/WINcjY2PgSiguxgd+/f79kZWUVJ9mFpqamB06fPu2ILmlhYfGSgYHhJckGUiPshmCyoRZgoZpJDCPWQACl4xkOKGBwHAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "G"
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Thoroughfare Cross Section Type"
    }
   ]
  }
 ]
}