Stacked density estimates

using Deneb

data = Data(url="https://vega.github.io/vega-datasets/data/penguins.json")

chart = Data(data) * Mark(:area) * transform_density(
    "Body Mass (g)",
    groupby=:Species,
    extent=(2500, 6500),
    steps=100,
) * Encoding(
    x=field("value:q", title="Body Mass (g)"),
    y=field("density:q", stack="zero"),
    color=:Species
) * vlspec(
    width = 500, height=200
)

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