[R] Transparent Bands in R

[mnstn]

Hello All,

My question is regarding the attached plot. I would like to have multiple
transparent green bands running the length (yaxis) of the plot the width of
which is determined by the green lines at y=0 in the plot. Can you suggest a
way to do it? 
For those who can't or are unwilling to download the file the plot is at
http://www.twitpic.com/ma8w0

Thanks!
http://www.nabble.com/file/p25983169/foo.ps foo.ps 
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