[Solved] Plotting multi histograms in one

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You should post the output from dput(Ft_max), that would make it easier for people to load your example.

Use functions from the tidyverse package to gather your data in two columns: “key” for the grouping and “values” for the actual values

require(tidyverse)
Ft_max %>%
    gather("key", "values") %>%
    ggplot(aes(x = values, fill = as.factor(key))) +
    geom_histogram()

This will give this:

enter image description here

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solved Plotting multi histograms in one