Hi Dav,

Thank you very much for your solution. Works perfectly. With respect to the second question, For example: If you have a first order polynomial (straight line), you can determine the a and b value in y = ax + b by using the "slope" and "intercept" command. If you have a second order polynomial in the form: y = ax^2 + bx + c, how can you detrmine the a, b and c value in the same way as the first order polynomial.

I hope I am a little bit more clear. If you have an answer, it would be great.

Niels