Hi Ottmar,

Am Thu, 24 Sep 2015 11:14:00 -0700 (PDT) schrieb BottleMan:

I use Excel 2007. Maybe that is the problem. I just repeated the entire operation and the result is the same.

the best and exactest trendlines you get with XY (scatter) charts.
I made some test and I guess you have a line chart.


Regards
Claus B.
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Vista Ultimate / Windows7
Office 2007 Ultimate / 2010 Professional