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   "layerId": 7,
   "layerName": "IRI",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "Failed < 10",
     "url": "4471d08a435ebed2cc2ad84f55adc2d0",
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    {
     "label": "Serious 11 - 25",
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    {
     "label": "Very Poor 26 - 40",
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     "values": [
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     "groupId": "0",
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     "width": 20,
     "values": [
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    },
    {
     "label": "Good 86 - 100",
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     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAWElEQVQ4jWNhoDJgGTWQYsAyAg20SeBx+P//f/1/BgYHSgxiZGA4wMjI2MhCDcNAAGzG//808DIjI2MjyGSqefnIgi8HGBgYDlDNhQxUBiyjBlIMBn8YAgD5jBgPEwbu4QAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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   ],
   "legendGroups": [
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     "heading": "Normalized IRI"
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}