Hi all, I will have to look further into this. I can check the results against GMT (grdfft), I think they may use tapering but will have to look at the code (C++). Can I confirm that clipping is done via resize_matrix? Cheers Lester -- Sent from: http://mailinglists.scilab.org/Scilab-users-Mailing-Lists-Archives-f2602246.html