Error Bars showing Standard Deviation

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Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "data": {"url": "data/barley.json"},
  "encoding": {"y": {"field": "variety", "type": "ordinal"}},
  "layer": [
    {
      "mark": {"type": "point", "filled": true},
      "encoding": {
        "x": {
          "aggregate": "mean",
          "field": "yield",
          "type": "quantitative",
          "scale": {"zero": false},
          "title": "Barley Yield"
        },
        "color": {"value": "black"}
      }
    },
    {
      "mark": {"type": "errorbar", "extent": "stdev"},
      "encoding": {
        "x": {"field": "yield", "type": "quantitative", "title": "Barley Yield"}
      }
    }
  ]
}