Bruce,

Problem is that when we do the fit in derivative and, save the results, something other than first derivative is written to the file. Have you ever looked at the saved/written file of a first derivative fit?

Thanks,

Ganga

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Ganga M. Hettiarachchi, Ph.D.

Assistant Professor of Soil and Environmental Chemistry

Department of Agronomy

2107 Throckmorton Plant Sciences Center

Kansas State University

Manhattan, KS  66506  USA

785-532-7209 (office)

785-532-6094 (FAX)