@Kitonum Thank you very much!

@acer Thank you very much!!!

@Chris_45 I didn't mention in the original question, but it is really important for me to get the associated function of the curve. I can get it using LeastSquares() function but with your code (where you use ArrayInterpolation()) the function is not generated in the end. Could you please indicate some way to do that? Thanks!

@Carl Love Thanks for your help! Perfect! I would like also to get the associated function to this curve (e.g. ak_^3+bk_^2+ck_+d). With LeastSquares() I get it in the end but not with the ArrayInterpolation()..Could you indicate how to do that please? Once more, thank you very much!

@Markiyan Hirnyk Thanks a lot! Completely solved!!! =)

@Carl Love Thank you so much!