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     "groupId": "0",
     "height": 20,
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    {
     "label": "70 - 75 dB",
     "url": "fce2d88349d4a210a870449c86df40a2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAATklEQVQ4jWPZmvS7goGRwYSBGuA/wxkWkGE8UoxvqWHel2f/TVgYqAxYRg2kGLBQbgQqGDWQcsBCBTNQwKiBIyMM/zOcAZW0VDHtP8MZAMTtD9SJO3YBAAAAAElFTkSuQmCC",
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     "groupId": "0",
     "height": 20,
     "width": 20,
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    {
     "label": " > 75 dB",
     "url": "0f564bd31840989df602acd95944e624",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAARElEQVQ4jWOR8b1dwcDAYMJAHXCGBWLY/7fUMY/RBGQgVQHLqIEUAxbKjUAFowZSDlioYAYKGDVwpIThGVBJSyXzzgAAS6oHL5fVHvQAAAAASUVORK5CYII=",
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     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
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   "legendGroups": [
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}