[gmx-users] Neutralizing the total charge of the system in vacuum

[OZGE ENGIN]

Hi all,

I am performing a simulation in vacuum. The peptide has  nonzero charge, so I attempted to neutralize the total charge via genion;however as it is known, it asks for a continuous group for replacing, but I have no solvent molecules for the replacement.

How can I neutralize the total charge while performing simulations in vacuum?

Thanks in advance

Oz.