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{  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",  "data": {"url": "data/cars.json"},  "mark": {    "type": "errorband",    "extent": "ci",    "borders": true  },  "encoding": {    "y": {      "field": "Miles_per_Gallon",      "type": "quantitative",      "scale": {"zero": false},      "title": "Miles per Gallon (95% CIs)"    },    "x": {"timeUnit": "year", "field": "Year"}  }}