[pstricks] shading area under a curve

[Herbert Voss]

Derek Collis schrieb:
> How can I shade the area under a curve between, say, x=a and x=b, as in 
> a typical integral problem.
>
> I can shade the area between two curves where their intersection points 
> form the left and right bounds; but what if the left and right bounds 
> are the vertical lines x=a and x=b.
>   
here is an example from the archives:
http://tug.org/mailman/htdig/pstricks/2001/000608.html

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Herbert