[gmx-users] g_potential

[minnale]

Hi,
I have small doubt that when we calculate elctrostaic potenitial of POPC  ,get system with neutral, POPC positive and water negative values, 
what is the reason behind that POPC has positive and water has negative values.
water has H+ ion and OH- ion it should be neutral but why negative values it showing.

Any suggestions would be appreciated. 

Thanks in advance.
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