Journal Quality R Graphs?

Thanks for your answer, Adai!

Being a newbie, I finally tried a lot of things and
wasted a stack of paper in 
order to get a black & white printer printable chart
of good quality.

My experiences are the following:
* do never (!) use the alpha correction color settings
for transparency if the 
graph is to be printed (alpha correction also works
with few formats, e.g. PDF 1.4)
* the library(gstat), bpy.colors() color palette
prints nicely in grey
* there is a small difference in output from saving
the graphs to PS or PDF with 
PS looking slightly better
* set the line width with par(lwd=)
* set the line style with par(lty="solid")
* in the print dialog before printing: check if the
automatic scaling option is set

After doing all of this, my chart looks rather
acceptable now.
The R version used was R 2.0.1 on win2k and printing
was done on a HP LJ 4M Plus.

Thanks again for your answers!

Best,
   Werner