Dear Sir/Madam, In gromacs tutor we have water .gro file for spc potential. How to get .gro files from spc216.pdb of different potentials like tip3p tip4p ... etc. -- With Regards, Ravi Kumar Venkatraman, c/o Prof. Siva Umapathy, IPC Dept., IISc., Bangalore, INDIA. Phone No: +91-9686933963