[R] Plotting shaded areas

[aoife]

May I ask, is it possible using plotrix to shade a group of variables
differentially from the rest of a graph, eg so the output looks similar to
this, where the nodes of open circles are my nodes of interest:

http://r.789695.n4.nabble.com/file/n4459137/Screen_shot_2012-03-08_at_12.18.34.png 

Many thanks 

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