Don wrote: . . >over any extended temp range. Hint -- buried in Excel somewhere there is a >polynomial curve-fitting wizard, I just don't remember where. . . Make a graph with your data, rightclick on the line you want to curve-fit..tada...there you can access the 'wizard'. Dead easy and handy :-) /Tony Tony KŸbek, Flintab AB ΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣ E-mail: tony.kubek@flintab.com ΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣΣ