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     "groupId": "1",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWM5M9PhPwOVgEn6AUYWahkGA6MGjho4auCogaMG0spAk/QDjNQ0EABbKAWt+SyiegAAAABJRU5ErkJggg==",
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     "groupId": "1",
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     "values": [
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    },
    {
     "label": "Upper Devonian",
     "url": "9a059788f82bb7503f3ffb61876bd12a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWP59HTZfwYqAT7pKEYWahkGA6MGjho4auCogaMG0spAPukoRmoaCABY4ATVAA4yvAAAAABJRU5ErkJggg==",
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     "values": [
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    },
    {
     "label": "Middle Devonian",
     "url": "8f4c1137af524a9bb86b9433afb59f84",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWP5dKb4PwOVAJ9JLyMLtQyDgVEDRw0cNXDUwFEDaWUgn0kvIzUNBABZkQUhwq2RgwAAAABJRU5ErkJggg==",
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     "groupId": "1",
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     "values": [
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     ]
    },
    {
     "label": "Lower Devonian",
     "url": "2456f1b7442056b1ca764b1bc1ae39c0",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWN5uinyPwOVgLTfckYWahkGA6MGjho4auCogaMG0spAab/ljNQ0EABaRwVi7E2HrgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
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     "values": [
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    },
    {
     "label": "Silurian",
     "url": "fca0d32ea8e593a17aafbe90a8f2b675",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWPZ9H//fwYqAT9GR0YWahkGA6MGjho4auCogaMG0spAP0ZHRmoaCABZYATiOYyorwAAAABJRU5ErkJggg==",
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     "groupId": "1",
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     "values": [
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    },
    {
     "label": "Ordovician",
     "url": "91585a1c7df709f87dc5976e4be741ba",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALElEQVQ4jWNh+J/2n4FagHEWIwvVDIOCUQNHDRw1cNTAUQNpZiDjLEZqGggABYAD7aBHgEwAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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    },
    {
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWNpOBP5n4FKoMFkOSMLtQyDgVEDRw0cNXDUwFEDaWVgg8lyRmoaCABbjQWth5KlWgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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    },
    {
     "label": "Precambrian",
     "url": "a139576f73bcb17958621dc756b6c740",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAALklEQVQ4jWP577DpPwOVAOMBP0YWahkGA6MGjho4auCogaMG0spAxgN+jNQ0EABagwVhvf+7VgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20,
     "values": [
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     ]
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "older named age"
    },
    {
     "id": "1",
     "heading": ""
    }
   ]
  }
 ]
}