Trellis Stacked Bar Chart

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Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "data": {"url": "data/barley.json"},
  "mark": "bar",
  "encoding": {
    "column": {"field": "year"},
    "x": {"field": "yield", "type": "quantitative", "aggregate": "sum"},
    "y": {"field": "variety", "type": "nominal"},
    "color": {"field": "site", "type": "nominal"}
  }
}