Hi Everybody, I want to perform a MD simulation (NPT ensemble). The system: Protein, SOL, Cl Do anybody know how much is the value of the tau_t for Cl- ion at 300K? I state the following: tau_t=0.1 ps is wrong. I tried tau_t=0.01 ps. It seems to be good, but it has aprox. 40 degrees fluctuation. Many Thanks, Akos Gellert