trajin ../traj/20-50ns_10frames_sol.mdcrd 1 11 1
strip :WAT:Cl-:CIO:Cs+:IB:K+:Li+:MG2:Na+:Rb+
center :1-3668 mass origin
image origin center
center :1-7336 mass origin
image origin center
rms first mass :1-3668
average _MMPBSA_avgcomplex.pdb pdb
trajout _MMPBSA_complex.mdcrd nobox