errorband2.vl

{
    "mark": {
        "borders": true,
        "extent": "stdev",
        "interpolate": "monotone",
        "type": "errorband"
    },
    "data": {
        "url": "https://vega.github.io/vega-lite/data/cars.json"
    },
    "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
    "encoding": {
        "x": {
            "field": "Year",
            "timeUnit": "year",
            "type": "temporal"
        },
        "y": {
            "field": "Miles_per_Gallon",
            "scale": {
                "zero": false
            },
            "title": "Miles per Gallon (1 stdev)",
            "type": "quantitative"
        }
    }
}