When I perform a NPT run by Forcite module, the default pressure unit is GPa. But I found the pressure control is not good.

For example, if I set the pressure to be 101 KPa (0.0001 GPa), then do a NPT dynamic. After the task is completed, I found the pressure

fluctuate between -0.01~0.36 GPa with a standard deviation about 0.30 GPa. I think the reason maybe the large pressure unit (up to GPa), which leads to a very small value 0.0001.

   How can I change the pressure unit to be Pa or bar? Can it be realized with perl script? If can, How to do it?

   Thank you.