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 "layers": [
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   "layerId": 0,
   "layerName": "Free air anomaly",
   "layerType": "Raster Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "61 - 298 mGal",
     "url": "abd39d71c6f9eedda0c0261ecc16583a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADtJREFUOI1jYaAyYKGlgf+pYB4jigv/zyffTMZERgYGBhp7edTAUQNHDRw1ELuBsCKITMCIbiBFpsEAANLFBLbaM35yAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "49 - 60 mGal",
     "url": "fc7835657e7e388129bd2be658a11bb7",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADxJREFUOI1jYaAyYKGlgf+pYB4jigv/M+wn3yQGRwYGBhp7edTAUQNHDRw1ELuBsCKITMCIbiAjJabBAABz4gOVK6/7FQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "42 - 48 mGal",
     "url": "d1a28cf51d06dcafe6e88f817396cee0",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADxJREFUOI1jYaAyYKGlgf+pYB4jigv/M9iSbxLDYQYGBhp7edTAUQNHDRw1ELuBsCKITMCIbiAjJabBAACgEAQXKU6YnwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "37 - 41 mGal",
     "url": "659144672c441fa6a0596b375baa99c4",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADlJREFUOI1jYaAyYKGlgf+pYB4jigv/a1Ng0lUITVMvjxo4auCogaMGYjcQVgSRCRjRDWSkyDgoAACoAwQpuVfVNQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "32 - 36 mGal",
     "url": "5fdda70132a64891e2feecbbc6afa88f",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADlJREFUOI1jYaAyYKGlgf+pYB4jigv/51Fg0iQITVMvjxo4auCogaMGYjcQVgSRCRjRDWSkyDgoAACQ+wPm9qdelwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "28 - 31 mGal",
     "url": "17bf54d936541c64cbe9d952cabc6612",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADlJREFUOI1jYaAyYKGlgf+pYB4jigv/T6XApGwITVMvjxo4auCogaMGYjcQVgSRCRjRDWSkyDgoAACDkwO/37Q3zgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "25 - 27 mGal",
     "url": "ac0aae2760fd9a8f47055a3d19b55e61",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADlJREFUOI1jYaAyYKGlgf+pYB4jigv/76bAJFcITVMvjxo4auCogaMGYjcQVgSRCRjRDWSkyDgoAAB2gwOZOjGPSQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "21 - 24 mGal",
     "url": "27c9aba995ebeec4084df21d6b8766f5",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADlJREFUOI1jYaAyYKGlgf+pYB4jigv/P6PAJCkITVMvjxo4auCogaMGYjcQVgSRCRjRDWSkyDgoAABnuwNuhKEB9AAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "18 - 20 mGal",
     "url": "c364ff70e51e2548a4a2316e79f38f8b",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADhJREFUOI1jYaAyYKGlgf+pYB4jigsvUmCkPiOEpqmXRw0cNXDUwFEDsRsIK4LIBIzoBlJmHBQAAG8hA4PGGMfkAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    },
    {
     "label": "15 - 17 mGal",
     "url": "2acb1a9bf5ea3805be66f73481b3626a",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADdJREFUOI1jYaAyYKGlgf+pYB4jigtbKDCyhhFC09TLowaOGjhq4KiB2A2EFUFkAkZ0AykzDgoAieYD0JP0fjYAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
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    },
    {
     "label": "11 - 14 mGal",
     "url": "82b356165835f47c3b7ea8e05fcd6d80",
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     "height": 20,
     "width": 20
    },
    {
     "label": "7 - 10 mGal",
     "url": "3e51a0e4d3d1b368266d54d03dce8ee2",
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    {
     "label": "-1 - 6  mGal",
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     "label": "-8 - -2  mGal",
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     "height": 20,
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    },
    {
     "label": "-212 - -22 mGal",
     "url": "ab9550f0c517d6144fd865d8ac5a4dc6",
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}