a character string. If the polygons in the spgeoIN object were derived from a shape file, this column indicates the name of the column used for area names. If the polygons in the spgeoIN object were derived from a text file leave as default (Default = "").
leg
Controls the plot legend and coloring scheme. Must be either continuous or discrete, (default = continuous).
show.occ
logical. Defines if the occurrence points should be added to the plot (default = F).
lin.col
character string. Defines the colour of polygon borders (default = grey).
lwd
numeric. Line width of polygon lines.
...
Arguments to be passed to other methods, such as graphical parameters (see par).