I'm working on a graphic but have run into a road block about two 
issues.  I don't have a color printer so I want to produce the graphic in 
black and white. I'm currently using this 
statement  trellis.device(bg="white")  but the body of the graphic contains 
color. What is the code to create the whole thing in black and white. The 
other issue might be a bit more tricky. I'm using this statement: 
auto.key=TRUE  and in the body of the graphic I'm getting two different 
symbols and on the screen I see two symbols in the key but when I print it 
the key only contains one symbol for both!

here's the whole R code statement:
dotplot(chemical~adjlogmle| convert*tdnew, data=allrisk , group=rodentx, 
main="Interspecies Conversion", pch=1:2, auto.key=TRUE, scales = 
list(tick.number=10), fontfamily = "HersheySans")

Thanks,

Dean Sonneborn M.S.
Public Health Sciences *
University of California, Davis
916 734-6656

* formerly Epidemiology & Preventive Medicine

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