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     "groupId": "0",
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     "values": [
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    },
    {
     "label": "4.5 - 5",
     "url": "cb4a529ee39be8bd92564cb0ea4e5bbe",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAR0lEQVQ4je3UsQ0AIAwDwRfyYGzGauxEHyEkGuq4Iz/AFS6sBb1Bx1DA1MWGA2yAMKcC0ylPvBWYTwbjqcAvNgyY52kdHWsD4REHxfc3P1gAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Average thermal conductivity"
    }
   ]
  }
 ]
}