[R] plot symbol "+", but with variable bar lenghts

[Rainer Machne]

Hi,

does anybody know of some plotting function or an easy way to 
generate "+" symbols with individually settable bar lengths?
I tried just combining "|" and "-" as pch and setting the size via cex, 
but that doesn't really work since the two symbols have different default 
lengths. Is there a horizontal | or a longer "-" available?

Thanks,
Rainer