plotting package for box plots

[Stephen B. King]

Greetings,

I am looking for a cheap / free plotting package capable of displaying 
raster data in a box plot or quantile plot graphic.  Preferably, the 
display would produce Postscript publication quality output.  Other 
statistical analysis would be helpful.  Anybody know if such a package 
exists?  

Thanks again-

Steve King					
Hydrologist				    	10159 East 11th St., Suite 300
NOAA, National Weather Service		    	Tulsa, Oklahoma  74128-3050
Arkansas-Red Basin River Forecast Center    	Off: (918)832-4109  
sbk at awips1.abrfc.noaa.gov		    	FAX: (918)832-4101