{ "$schema": "https://vega.github.io/schema/vega-lite/v4.json", "data": { "values": [ { "ci1": 23.5007, "ci0": 19.6912, "center": 21.5735, "Year": 189302400000 }, { "ci1": 25.8214, "ci0": 20.8554, "center": 23.3750, "Year": 220924800000 }, { "ci1": 26.4472, "ci0": 21.9749, "center": 24.0611, "Year": 252460800000 }, { "ci1": 27.7074, "ci0": 22.6203, "center": 25.0931, "Year": 283996800000 } ] }, "layer": [ { "mark": "errorband", "encoding": { "y": { "field": "ci1", "type": "quantitative", "scale": {"zero": false}, "title": "Mean of Miles per Gallon (95% CIs)" }, "y2": {"field": "ci0"}, "x": { "field": "Year", "timeUnit": "year" } } }, { "mark": "line", "encoding": { "y": { "field": "center", "type": "quantitative" }, "x": { "field": "Year", "timeUnit": "year" } } } ]}