graphics support in R help files

I looked through the "Writing R Extensions" pdf, and I don't see how graphics
can be input in help files. For example, if I had a .eps plot that I wanted
to include in a help file, what would the syntax be to include it in an R
help file?

If there is graphics support in help files, which format are supported (e.g.,
gif, png, jpg, eps, ps)? Thanks,

-Len Kannapell