repeatinglayers.vl

{
    "data": {
        "url": "https://vega.github.io/vega-lite/data/movies.json"
    },
    "repeat": {
        "layer": [
            "US_Gross",
            "Worldwide_Gross"
        ]
    },
    "spec": {
        "mark": "line",
        "encoding": {
            "color": {
                "type": "nominal",
                "datum": {
                    "repeat": "layer"
                }
            },
            "x": {
                "field": "IMDB_Rating",
                "bin": true,
                "type": "quantitative"
            },
            "y": {
                "field": {
                    "repeat": "layer"
                },
                "aggregate": "mean",
                "title": "Mean of US and Worldwide Gross",
                "type": "quantitative"
            }
        }
    },
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json"
}