Hello, I have a comment regarding the Gromacs manual. For equation (3.62) in Chapter 3.8, \epsilon_i is called the friction constant. This is incorrect since in that equation \epsilon is actually collision frequency and should be represented with the letter \gamma. The product of the collision frequency with the atomic mass gives the friction constant (\zeta). It will also be helpful to add to description of the mdp options for Langevin dynamics the fact that for bd_fric=0, \zeta = m / tau_t, where tau_t is the inverse of the collision frequency \gamma. I say all this since in other packages you define \gamma directly and not its inverse, and this can cause confusion.
Thanks Marius
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