[gmx-users] freezing error

[dsh2002 at med.cornell.edu]

Hello all,
I am trying to freeze a group of residues, but I get an error when I run
grompp. I specify the freeze group and dimension in my .mdp file with;

;       Non-equilibrium MD stuff =
freezegrps      = r_1-286
freedim         = Y Y Y

Then, I get the error:
"Fatal error: Invalid Freezing input: 1 groups and 0 freeze values"

But, I do not know where and how to input the freeze value.

Any help would be much appreciated,
Danny.