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     "groupId": "2",
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    },
    {
     "label": "Silurian",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOUlEQVQ4je3MMREAMAgDQHIXYxhAbA1UGp2Zk628gOfp22FSSDDMuKGMejFtqKPhGDbU8cOwkHCOD1lgBOKBGdphAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "2",
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    },
    {
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAANElEQVQ4je3MsREAMAgCQLljVodyWVNbQxd+gGdtb7lgwDJjQhn14kqoo+E4Eur4Y4iBc3wFgAPtNj8p9gAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "2",
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     "width": 20,
     "values": [
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    },
    {
     "label": "Upper Ordovician",
     "url": "72ce3daf988d493305db28ab359d70f7",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAN0lEQVQ4je3MMREAMAgDQHIXr9jARtXCzJxs5QU8q1+HSSHBMOOFMurFdqGOhmO5UMcPw0LCOQ5adAU6pprKYQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "2",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Cambrian",
     "url": "5d4714238cf8397de6c137f0cd39e027",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOklEQVQ4jWNpOBP5n4FKoMFkOSMLA5UBy6iBFAMWyo1ABaMGUg5YqGAGChg1kHLAMgINbDBZzkhNEwFbjQWtFx23xgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "2",
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    },
    {
     "label": "Precambrian",
     "url": "02266cedf7e2ea3e7cdf2ee0d4612013",
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     "contentType": "image/png",
     "groupId": "3",
     "height": 20,
     "width": 20,
     "values": [
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    },
    {
     "label": "Proterozoic",
     "url": "b3b3f7e1f0c9efc607df027514495f7d",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAOUlEQVQ4je3MMREAMAgDQHIXR3WDwLpBE52Zk628gGef22GCSjDMuKGMejFtqKPhGDbU8cMQlXCOD1rCBXqQ5MG5AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "3",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    },
    {
     "label": "Neoproterozoic",
     "url": "678d6ff6dbf397227f61bd03a80a033a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAN0lEQVQ4je3MsQ0AMAgDMCLlvXJsOZDOzMlWfIDZ93SYIAsMM24oo15MG+poOIYNdfwwRBac4wNZ9wVUc8epTgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "3",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "Cenozoic"
    },
    {
     "id": "1",
     "heading": "Mesozoic"
    },
    {
     "id": "2",
     "heading": "Paleozoic"
    },
    {
     "id": "3",
     "heading": "Precambrian"
    }
   ]
  }
 ]
}