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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAA8CAYAAABmdppWAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAu0lEQVRYhdXYiw3DIAxFUf9t2v23besscSOlDHD0DAgDoZor4AjVIT0JNxr0w4LhLxZMOmEanLBwUN8s2AsnbIEXpRcHCwY1WXA0WLDMWHAcBsuVBdto0FHvlpJR746S+YRoW5Zoo0F6Dtt+NAiXPHTCosFxOqF/WbAfD+IlV35gsOCEkTCYDe9D50H4cLADdz2D217oocHBQfh+qAPfYOUPQPgVINM0+PiEDYN78ITwr4gMDC6/bdj38gX74Bqn4I9lswAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 60,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Vessels per day \\ Navires par jour"
    }
   ]
  }
 ]
}