[gmx-users] Replica exchange and wham

[Sanku M]

Hi,
    Occasionally I hear that one need to use WHAM( weighed histogram analysis) 
method in collaboration with  Temperature-Replica exchange simulation. But, I 
was not understanding why one need to use WHAM with temperature-remd simulation. 
Can someone explain me ?
Does one need to use any sorts of WHAM to analyze the trajectory obtained from 
T-REMD simulation of Gromacs ?
 The fact is that I am trying some replica-exchange simulation in gromacs and I 
get all the trajectory which I believed corresponds to each individual 
temperature. I was wondering whether someone can explain me whether I need to 
some WHAM-like post processing to get the data.
Sanku
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