This file has no comment lines. If the user wants to change the numbering of nodes in deeper layers, this should be done first. A blank line follows. After that, the boundary of the three-dimensional area has to be defined, followed by a blank line. Then either the parameters for subdivision into layers or the exact z-coordinates follow. The layer definition is completed by the subdivision data type without any parameter. After another blank line, the other input data follow.

Format description of the model and 3D file