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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4je3UMQoAIAxDUQs5mJ5cbxYRVNo5Hfsn6fCQDgVJtsTg3ku0ugeXmQ1FIzkP6n+YEgqUg07ECtRDghEqUO/tsN97phQO7B+obfHLDsmpWerkAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "white"
     ]
    },
    {
     "label": "Yellow",
     "url": "0c195b38fdd5c56cab320f395ce641ab",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAT0lEQVQ4je3UMQoAIAxD0Qo5mJ5cbxYRVNo5Hfsn6fCQDgVptMTg3ku0ugdXazYUjbR5UP/DlFCgHHQiVqAeEoxQgXpvh/3eM6VwYP9AbQOovwvLMU8lEAAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "yellow"
     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Colour"
    }
   ]
  }
 ]
}