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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATElEQVQ4jWNhoDJgGTWQYsBCuRGoYNRAHODo/wYGBoZ6BgaGRgZrRhCb4jCsR6KpYmAj3IUEAAtRxkG8iddlMDCabCgHLFQwY4gZCAC35wiMH75yDwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "numbEMS",
     "url": "465c3a72ef0dc57d481fabbe62c4aebe",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWNhoDJgGTWQYsBCuRGoYNRAHCDmaQMDA2M9A8P/RoYl0g0MlIchYz0STQ0D/zfCXUgAsBBlHsSbeF0GA6PJhnLAQgUzhpiBAJW5DBCYDIBSAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    },
    {
     "label": "BIcountnum",
     "url": "8886eda90736244c1e71f41bf6d339e0",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAVElEQVQ4jWNhoDJgGTWQYsBCuRGoYNRA7GBl2tkGRgaG+v8MDI3hs4wbGCgNQ0YGhnokmnID/zMwNMJcSEgtCzEGQr2J12UwMJpsKAcsVDBjiBkIAN4kDXWEZroTAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "1 Dot = 60"
    }
   ]
  }
 ]
}