Dear Johan, Virtually _all_ the variables are available because of the include 'TOTAL' statement. Geometry is in arrays xm1,ym1,zm1. N^3 x Nel is the data layout for all arrays, save for surface variables such as unit normals and surface area of each face of each element. (unx,uny,unz,area). Paul ________________________________ From: [email protected] [[email protected]] on behalf of [email protected] [[email protected]] Sent: Friday, September 23, 2016 8:46 AM To: [email protected] Subject: [Nek5000-users] Definition of variables in the .usr file? Dear All, Is there any documentation of all variables that I have available in the .usr file? For example, in the User Guide it is explained you to modify a mesh for a straight pipe into a pipe with a width that varies along it. You use then * The variable "ntot". Which I guess is the number of vertices, but i it? * The variable "ym1", which seems to be a 4D tensor. Here you change the element ym1(i,1,1,1) for i = 1,ntot. Is this the y-position of the verices? What alse does ym1 contain? These and other variables are variables that I would appreciate to know the definition of. Is it available somwhere? Best, Johan