[R] how can i superpose 2 graphs

From: hanen <hanen.mastouri_at_yahoo.fr>
Date: Sun, 18 May 2008 10:18:24 -0700 (PDT)


i tried to do this by:

but the result is one picture but y-axis has 2 différent graduations.how can i correct this?( i want one graduation on y axis).

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