Hi, Does anybody knows how to save the velocities of a group of particles every N time steps without having to write the .trr file for the whole system? I mean my system has two kinds of molecules say A and water what I want is to save the velocities for the atoms in the molecule A every certain number of steps. The .trr file seems to be very big. Therefore I just want to write the velocities of the molecule A which is small.
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