I have a question about the definition of lateral pressure. Many of the papers that I have read that have used gromacs for dppc/water models have used a negative value (-10, ..., -100, etc) for the lateral pressure (X and Y) and 1atm for the Z direction. Is the lateral pressure the external or internal pressure as implemented in gromacs? If it is interanl pressure than I would expect the cell to contract in the x and y direction. Is this correct?

Any information would be greatly appreciated!

Sincerely,

Lisa M. Perez

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Lisa M. P?rez, Ph.D.

Manager, Laboratory for Molecular Simulation

http://www.chem.tamu.edu/LMS/

Texas A&M University               [EMAIL PROTECTED]
Dept. of Chemistry                 Chemistry Bldg. RM. 2109
P.O. Box 30012                        office (979) 845-9384
College Station, TX 77842-3012           fax (979) 845-2971

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