(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
logical. Should the name of each cone be printed next to the
corresponding vertex?
labels.cex
size of the arrow labels.
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').
square
logical. Should the aspect ratio of the plot be held to 1:1?
(defaults to TRUE).