[R] Colormap that look good in gray scale

[thibert]

Hi,
   I am looking for a colormap (in color) that look like a gradient in gray
scale. It is to allow people without color printer to print the color graph
and have something meaningful in gray scale. 

It can be something like this 
plot(1:6,col=c(1,7,5,3,2,4),pch=c(1,20,20,20,20,20))
but with an arbitrary number of different colors, not just six.

Thanks
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