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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOklEQVQ4jWP5GsTQwEAlwL2OoYGFgcqAZdRAigEL5UagglEDKQcsVDADBYwaSDlgGYEGcq+jXhUAAgAI/gSK0kwKSQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      20
     ]
    },
    {
     "label": ">20 mg/L",
     "url": "0e5d6c78d05e23a1088d48c52dcba701",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAN0lEQVQ4je3VoREAMAzDQAOxLJ2ly3uFwTZrfgBRcaRWSEmNwtigDT8xbdBHoDFs0MeHwQou4Lm0iwLcOORPagAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      1000
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "DGNO3_1600"
    }
   ]
  }
 ]
}