A ggESDA object. It can also be either RSDA object or
classical data frame,which will be automatically convert to ggESDA
data.
mapping
Set of aesthetic mappings created by aes() or aes_().
If specified and inherit. aes = TRUE (the default),
it is combined with the default mapping at the top level of
the plot. You must supply mapping if there is no plot mapping.
It is the same as the mapping of ggplot2.