[gmx-users] Not enough ref_t and tau_t values

[balamurugan r]

Sir,
 I have system with non-zero total charge (+2)and i have added 2 CL- ions using genion but i dont know how to manipulate the parameters for T-coupling when I run grompp -full it says 
"Not enough ref_t and tau_t values"

The values in the full.mdp are

T-couple Berendsen
tc groups    protein     SOL
tau_t          0.1       0.1
ref_t          300       300

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