How to fit data set of different scales with nonlinear least square!

From: pp (ut_superman_at_yahoo.com.cn)
Date: 06/12/04 

Date: 12 Jun 2004 10:52:26 -0700

I have two data sets of the same x-coordinate, but their y-coordinate
have different scales. Y-coordinate of the first data set is about
10^2,while the second data set is about 10^(-2), now I add them
together and form a new data set.

Next I want to fit them with nonlinear least square method, but
becasue of the different scales, fitting result only reflect the trend
of the first data.

How can I fit so that the fitting result can reflect them both?

Thanks a lot!

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