Box & Whisker

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  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "data": {
    "values": [
      {"group":"A","v":4.2},{"group":"A","v":4.8},{"group":"A","v":3.9},{"group":"A","v":5.1},{"group":"A","v":4.4},{"group":"A","v":4.0},{"group":"A","v":5.6},
      {"group":"B","v":6.3},{"group":"B","v":5.9},{"group":"B","v":7.2},{"group":"B","v":6.8},{"group":"B","v":6.1},{"group":"B","v":6.5},{"group":"B","v":7.4},
      {"group":"C","v":3.1},{"group":"C","v":3.6},{"group":"C","v":2.9},{"group":"C","v":4.1},{"group":"C","v":3.4},{"group":"C","v":3.0},{"group":"C","v":3.8}
    ]
  },
  "mark": {"type":"boxplot","extent":"min-max"},
  "encoding": {
    "x": {"field":"group","type":"nominal"},
    "y": {"field":"v","type":"quantitative"},
    "color": {"field":"group","type":"nominal","legend": null}
  },
  "width": 360, "height": 280
}