Minimization With Constraint of 0.5kcal/mol.A^2

GROMACS version:
GROMACS modification: Yes/No
Here post your question

Hi,

I am trying to use a constraint of 0.5kcal/mol.A^2 for the first 1000 steps of minimization for the protein-ligand complex. As I am new to gromacs. Could you help me to figure out the change I have to make from the default form of minimization?

Thank you,