Table Heatmap
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Vega-Lite JSON Specification
{
"$schema": "https://vega.github.io/schema/vega-lite/v3.json",
"data": {"url": "data/cars.json"},
"mark": "rect",
"encoding": {
"y": {"field": "Origin", "type": "nominal"},
"x": {"field": "Cylinders", "type": "ordinal"},
"color": {"aggregate": "mean", "field": "Horsepower", "type": "quantitative"}
}
}