geo_constant_value.vg.json

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          "fields": ["longitude", "latitude"],
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          "opacity": {"value": 0.7},
          "fill": {"value": "gray"},
          "ariaRoleDescription": {"value": "square"},
          "description": {
            "signal": "\"longitude: \" + (format(datum[\"longitude\"], \"\")) + \"; latitude: \" + (format(datum[\"latitude\"], \"\"))"
          },
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          },
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