NCS
Noncrystallographic Symmetry Program
NCS is a program for performing the basic operations required to use noncrystallographic symmetry in refinement. It has two classes of commands depending on whether this symmetry is being constrained or restrained. When noncrystallographic symmetry constraints are being applied the SCATTER, GATHER, and PUNCH commands are used. With restraints the CURVATURE, GRADIENT, and FUNCTION commands are used. These commands are described in the ``Command Statements'' section.