Hi Nek's, I would like to copy a PN field to a PN-2 field, how can I do that ? let's say "a(lx1,ly1,lz1,nelt)" is given and I want to interpolate "a" onto a field "b(lx2,ly2,lz2,nelt)" and of course I use a PN-PN-2 method, not splitting. Vincent.