# set up two variables for Phi and Psi dihedral angles
phi: TORSION ATOMS=5,7,9,15
psi: TORSION ATOMS=7,9,15,17
# the restraint on phi
RESTRAINT ARG=phi AT=-1.5 KAPPA=5000 LABEL=restraint
# monitor the two variables and various restraint outputs
PRINT STRIDE=1 ARG=* FILE=COLVAR
