plotting two curves: Why same hight?

R 1.5.1 in a linux machine.

I am plotting two curves with curve ():

sin(x)/10 and sin(x)

together, one below the other one ( using par ( mfrow = c ( 2, 1 ))).
What I have noticed is that both curves have the same height but this
should not be so since the range of values of the first function is
shorter than the one of the second function.

In the description of par I could not find any command to fix the
solution.

Thank you.
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