[gmx-users] (no subject)

[Mahboobeh Eslami]

hi GMX  users 
i want to use Reaction-Field for coulombtype in mdp file.
i dont know that what parameters must be added in mdp file. 
i saw the following parameters in some of mdp fiels:

; Method for doing electrostatics
coulombtype              = reaction-field
rcoulomb-switch          = 0
rcoulomb                 = 0.80
; Dielectric constant (DC) for cut-off or DC of reaction field
epsilon-r                = 1
epsilon-rf               = 0

What values ​​can rcoulomb-switch take?
what values are the best for epsilon-r and epsilon-rf?
Thank you sincerely.