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// Create random density data
val rand = java.util.Random(42)
val n = 500
val dataset = dataFrameOf(
    "rating" to List(n / 2) { rand.nextGaussian() } + List(n / 2) { rand.nextGaussian() * 1.5 + 1.5 },
    "cond" to List(n / 2) { "A" } + List(n / 2) { "B" }
)

// Density plot
val myPlot = plot(dataset) {
    groupBy(cond) {
        densityPlot(rating, trim = true) {
            fillColor = Color.GREY
            alpha = 0.6
            borderLine.color("cond")
        }
    }
}

myPlot