[R] Filled box on graph

[John Janmaat]

Hello All,

I need to indicate a range on a plot.  It would be best as a filled 
rectangular region.  Do functions exist to draw filled boxes on a plot?

Thanks,

John.
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Dr. John Janmaat
Department of Economics, Acadia University, Wolfville, NS, B4P 2R6
E-mail: jjanmaat at acadiau.ca        Web: http://ace.acadiau.ca/~jjanmaat
Tel: 902-585-1461		   Fax: 902-585-1070