Bar and tick

A tick is convenient for stroking the upper bound of a bar for emphasis.

Plot.plot({
  x: {label: null},
  y: {percent: true},
  marks: [
    Plot.barY(alphabet, {x: "letter", y: "frequency", fillOpacity: 0.2}),
    Plot.tickY(alphabet, {x: "letter", y: "frequency"}),
    Plot.ruleY([0])
  ]
})

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