shaded region

["C. Zalinescu" <zalinesc@uaic.ro>]

Dear Colleagues,

I would like to draw some shaded regions without the contour (boundary) to 
be marked (like for a nonclosed path, between the origin and the end of the 
path).
Do you know a solution? One seems to be to draw once again the path with 
white color, but I would like to have a more smart solution.

Yours,
Constantin