



Hi, Can someone help me with the following?  I currently have the following plot: plot(c(0,14,0,14),c(0,5,0,5),ann = FALSE, xaxs="i", yaxs="i",bty="L" )
polygon(c(0,18,18), c(0,6,0), col='light grey', border = NA)
polygon(c(0,18,18), c(0,2,0), col='grey', border = NA) However, I would like to make such a plot, but where there is a continuous shading changing fom white to darkgrey. Can anyone give me any suggsetions how to do this in R? Thank you, Elisabeth   		 	   		  
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