lammps/examples/USER/colvars/in.peptide-colvars2

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# Solvated 5-mer peptide
units real
atom_style full
pair_style lj/charmm/coul/long 8.0 10.0 10.0
bond_style harmonic
angle_style charmm
dihedral_style charmm
improper_style harmonic
kspace_style pppm 0.0001
read_data data.peptide
neighbor 2.0 bin
neigh_modify delay 5
timestep 2.0
group peptide type <= 12
group one id 2 4 5 6
group two id 80 82 83 84
group ref id 37
group colvar union one two ref
fix 1 all nvt temp 275.0 275.0 100.0 tchain 1
shell "rm -f peptide2.colvars.*"
fix 2 all colvars peptide.colvars2 output peptide2
fix 4 all shake 0.0001 10 100 b 4 6 8 10 12 14 18 a 31
#dump 1 colvar custom 1 dump.colvar2.lammpstrj id xu yu zu fx fy fz
#dump_modify 1 sort id
thermo_style custom step temp etotal pe ke epair ebond f_2
thermo 10
run 100