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                    "type": "quantitative",
                    "axis": null,
                    "stack": "center"
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    ],
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        }
    },
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        "url": "https://vega.github.io/vega-lite/data/cars.json"
    },
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        "scale": {
            "color": "independent",
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    "$schema": "https://vega.github.io/schema/vega-lite/v4.json"
}