(required) a data frame, possibly a result from the colspace
or categorical function, containing values for 'x' and 'y' coordinates
as columns (labeled as such).
labels
plot verticy labels? Defaults to TRUE.
labels.cex
character expansion factor for category labels when labels = TRUE).
tick.loc
a numeric vector specifying the location of tick marks on x & y axes.
achro
should a point be plotted at the origin (defaults to TRUE)?
achrosize
size of the point at the origin when achro = TRUE (defaults to 0.8).
achrocol
color of the point at the origin achro = TRUE (defaults to 'grey').
margins
margins for the plot.
square
logical. Should the aspect ratio of the plot be held to 1:1?
(defaults to TRUE).