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     "label": "Weak negative (-0.2 to -0.1)",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAT0lEQVQ4jWMpKszdzsT4z4GBCuDff6YDLCDDOsO2clDDwPJV3g4sDFQGLKMGUgxYKDcCFYwaSDlgoYIZKGDUwBERhv/+Mx0AlbTUMAxkFgBjShILBRfR0AAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      0.2
     ]
    },
    {
     "label": "Moderate negative (-0.5 to -0.2)",
     "url": "45e96c715477bb637296b4bdcd637e20",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAT0lEQVQ4jWMpys/dzsTwz4GBCuAfA9MBFpBh3XILOahhYOmjeAcWBioDllEDKQYslBuBCkYNpBywUMEMFDBq4IgIw38MTAdAJS01DAOZBQD5Dg9UEzGGEAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      0.5
     ]
    },
    {
     "label": "Strong negative (-1.0 to -0.5)",
     "url": "ed59ffa050078ef0e800c44911cf76f7",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAT0lEQVQ4jWMpys3dzvT/nwMDFcA/RqYDLCDDui6s46CGgWUGQQ4sDFQGLKMGUgxYKDcCFYwaSDlgoYIZKGDUwBERhv8YmQ6ASlpqGAYyCwA0ChCVqUd1xwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      0.815923207227555
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Correlation"
    }
   ]
  }
 ]
}