Hello everybody, I am trying different ways of interpolating a surface. Now, I am trying to interpolate these values using the MBA package. In order to do it I am using the surface option of the package. mba.surf(xyz, 20, 20, n = 1, m = 1, h = 8, extend=FALSE, sp=FALSE, ...) The function is giving me some results but not reliable at all. Maybe it's due to the n,m and h values which are not corresponding to my data. I don't understand what should be the value of h. Even I read the article cited in the pdf. Someone could maybe help me.Also what should be the value of n and m. My data are pasted below corresponding to xyz. Thank you very much Regards Pierre 4.00 45 -83.94753324 4.00 50 -115.8679098 4.00 55 -134.7855557 4.00 60 -144.6370393 4.00 65 -148.7164562 4.00 70 -149.4758468 4.00 75 -148.641352 4.05 45 -104.1007536 4.05 50 -128.2620683 4.05 55 -141.8810486 4.05 60 -148.3151116 4.05 65 -150.2664062 4.05 70 -149.7559503 4.05 75 -148.1990977 4.10 45 -118.9805984 4.10 50 -136.721655 4.10 55 -146.0525858 4.10 60 -149.7327347 4.10 65 -149.9930389 4.10 70 -148.4927918 4.10 75 -146.3873601 4.15 45 -129.467342 4.15 50 -141.998465 4.15 55 -147.8625806 4.15 60 -149.343257 4.15 65 -148.2761684 4.15 70 -146.0179853 4.15 75 -143.5069876 4.20 45 -136.3899382 4.20 50 -144.6996352 4.20 55 -147.7834847 4.20 60 -147.526368 4.20 65 -145.433249 4.20 70 -142.6081123 4.20 75 -139.8085943