Dear gmxers,
   According to my recent practice, we find that the Berensen methods for T- 
and P- coupling can yield reasonable averaged density as a function of 
temperature, but when the v-rescale method and the Parrinello-Rahman method are 
employed for T- and P- coupling, somewhat unexpected results (i.e. density at 
higher temperature is bigger than that at lower tempearature) are obtained. 
Generally, the latter setup is considered to be prefered to the former one in 
simulating realistic ensemble. I am using gmx-4.5.3, and previously I have also 
performed one similar work using 4.0 which can generate expected results using 
the latter setup. I wonder if this version 4.5.3 has some bugs in calculating T 
and P, and are they dealt with in 4.5.4? Please give me some hints.
  
 Yours sincerely,
 Chaofu Wu, Dr.
  ------------------
  Department of Chemistry and Materials Science, Hunan University of 
Humanities, Science and Technology, Loudi 417000, the People’s Republic of 
China (P.R. China)
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