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{  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",  "data": {"url": "data/barley.json"},  "layer": [    {      "mark": "errorbar",      "encoding": {        "y": {          "field": "yield",          "type": "quantitative",          "scale": {"zero": false}        }      }    },    {      "mark": {        "type": "point",        "filled": true,        "color": "black"      },      "encoding": {        "y": {          "field": "yield",          "aggregate": "mean",          "type": "quantitative"        }      }    }  ]}