Excel's chart smoother appears to use Bezier curves. Brian Murphy has
posted code for Bezier curves, but the link he gave
http://www.xlrotor.com/excel_stuff.htm
appears to be obsolete. I

In most cases, the difference between Bezier curves and cubic splines is
minimal. An example where the difference is noticeable is
http://www.google.com/groups?threadm...0no_e-mail.com
David Braden has posted code for cubic splines, but Google changed their
addressing and my saved link is now broken. You might find it by searching.

I could e-mail you a .zip file of Brian Murphy's workbook and David
Braden's VBA code if you like.

Jerry

wysz wrote:

I would love to know how to get Excel to read the coordinates at a point on a
graph, BETWEEN the data points.

Thanks muchly

Jeff