Hi all,

I was wondering if it's possible to start a simulation by reading the starting 
configuration from a file and the initial velocities from somewhere else. The 
goal is being able to "continue" a simulation of a mostly equilibrated system, 
but where I change slightly the coordinates of some atoms (in particular, of 
some frozen atoms).

The closer I could get to that was modifying the final .gro file of the first 
simulation, which includes coordinates and velocities. But the precision of the 
.gro file is relatively low. I tried using both a .gro (without velocities) and 
.cpt files for starting the new simulation, but initial velocities are then 
assigned as 0.000. I also tried trjconv to convert the .cpt to .gro with higher 
precision (-ndec), but only coordinates are written in this case (although I 
explicitly added -vel). I guess I could manually add the velocities after 
getting them with gmxdump, but is there some other more straightforward way?

Thanks,
Ignacio
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