fix_modify AtC mesh create_nodeset <id> <xmin> <xmax> <ymin> <ymax> <zmin> <zmax>
 fix_modify AtC mesh create_nodeset lbc -12.1 -11.9 -12 12 -12 12  
Command to assign an id to a set of FE nodes to be used subsequently in defining boundary conditions.
Coordinates are assumed to be in lattice units.
 1.6.1
 1.6.1