Dear Colleague,

A bug has been found in the Dissipative Particle Dynamics (DPD) code of DL_MESO 
2.5.

An incorrect value for the random parameter of the Langevin barostat is 
currently being assigned: while this has no influence on the ability of the code 
to achieve the required system pressure, it does affect the resulting 
distributions of system pressure and volume and produces overly large standard 
deviations for these properties. Many thanks are due to Yaser Afshar (Johannes 
Gutenberg University) for bringing this bug to our attention.

To fix the above bug, please replace line 196 in config_module.f90 with

  sigmalang = SQRT (2.0_dp * bbaro * psmass * temp / (3.0_dp * tstep))

Minor changes have also been made to the user manual to reflect the above 
modification: this can be downloaded from the main DL_MESO website.

We strongly recommend that all registered users of DL_MESO version 2.5 should 
either make the above code change or re-download the package using the 
instructions received on registration to get the corrected version of the 
software. Re-registration is not required and the same password is used for 
decryption.

Michael Seaton
2012-09-03