[gmx-users] query on Free energy perturbation

[Sanku M]

Hi,
  I was planning to use Thermodynamic integration to calculate solvation free 
energy of a molecule in a solvent. I was following Justin Lemkul's online 
tutorial.
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin/gmx-tutorials/free_energy/01_theory.html

 
. I found that 
   a) a sd integrator is used in stead of usual md integrator ( Leap-Frog 
integrator). I was wondering whether is it a specific recommendation for 
thermodynamic integration to use stochastic integrator ?
  b) I also found  DispCorr                  = EnerPres was also used to Apply 
long range dispersion corrections for Energy and Pressure . Is it also a 
recommendation to use with thermodyanmic integration technique ?
Thanks
Jagannath
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