Hello,<br><br>I have been using g_wham, but I have a few questions that I can't find answers to online. When using WHAM, one does not need the forces between the pull groups to calculate the PMF, yet g_wham won't run without it. Is there a reason for this?<br>
<br>Also, when using the pull code, I am allowed to define the spring constant K for umbrella sampling, but I do not designate where the umbrella potential is centered. How does gromacs determine this? I am interested as I would like to create a PMF using umbrella integration (from code I will write myself) rather than use WHAM. To do this and still use the umbrella sampling runs used with GROMACS, I need to know where my umbrella potentials are centered.<br>
<br>Thank you,<br>Jennifer<br>