no unnamed argument, added to force named binding of later arguments.
annot_size
numeric scale annotation text (if present)
colorPalette
name of a Brewer palette (see https://colorbrewer2.org/ )
adjust_x
numeric: adjust x density plot
adjust_y
numeric: adjust y density plot
Details
xvar and yvar are the coordinates of the points, and cvar is the
discrete conditioning variable that indicates which category each point (x,y) belongs to.