lammps/examples/USER/colvars/peptide.colvars

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# collective variable example: monitor distances
colvarsTrajFrequency 1 # output every 10 steps
colvarsRestartFrequency 1000
colvar {
name one
distance {
group1 {
atomNumbers 2 4 5 6
}
group2 {
atomNumbers 37
}
}
}
colvar {
name two
distance {
group1 {
atomNumbers 80 82 83 84
}
group2 {
atomNumbers 37
}
}
}
harmonic {
name h_pot
colvars one two
centers 10.00 10.0
forceConstant 100.0
}