API Forces

add_allowed_plane_region([molecular_system, ...])	Add a flat-bottom restraint confining atoms near a reference plane.
add_allowed_z_region(molecular_system[, ...])	Convenience wrapper adding a plane restraint perpendicular to z.
add_constant_force(molecular_system[, ...])	Apply a constant external force to a selection of atoms.
add_forbidden_plane_region([...])
add_forbidden_z_region(molecular_system[, ...])
add_harmonic_bond_force([molecular_system, ...])
add_plane_harmonic_restraint([...])
add_point_harmonic_restraint(molecular_system)
pin_atoms(molecular_system[, selection, ...])