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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQ0lEQVQ4je3QsQ0AIAzEQEfKYDA5bAYSSkOdpyIe4Ao74rzAdP4xuKBlIIN5gcDIgBzz8cMuBS0eyEBVLpOiAvPJH26MKwQTwZSNwwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "Red,2",
      "Red,5"
     ]
    },
    {
     "label": "CTA Yellow Line",
     "url": "cf5a2b2dad9fbba2b485810909c1243e",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAARklEQVQ4je3QoREAIBADwfuZFAaVQ2dgEID9ODgVtSLCnD6YTg+DY1AyUAT9AIGWAYG4QUvadrWCsT6wga5kk1YfzGf/cAJQpQUUeBbdKQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "Yellow,2"
     ]
    },
    {
     "label": "Noncommuter Railroad",
     "url": "b3966366900f6648375e7ac703af2248",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAbklEQVQ4jWNhoDJgGTWQYsAyvAws9GZQYmZhUOrZyLCHKgYyszAoEVLDAmOU+DA0EFL8/y/EwBIfBht0uZ4tEP20C8MeqA34QIk/gwtYLbXCEAT+/mG4x4AHsDCQAPC5bJgmbGIAC1GqSACD30AA+QITJHSEulUAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "ALIAS_NAME, COMM_STATUS"
    },
    {
     "id": "1",
     "heading": ""
    }
   ]
  }
 ]
}