[texhax] Problem about make a figure masked

[Paulga]

Hi,


I have a sinusoidal wave figure showing the contour of polymer stress. When
I place it into my pdf file I  would like to put a masking layer on it so
that only the part of contour between the top and bottom walls of the wave
is visible, the area outside blank. But I cannot find any method how to
achieve this. Any help would be appreciated. Thanks in advance.



-- 
Best wishes,
Jene
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