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gmx-potential - Calculate the electrostatic potential across the box


gmx potential [-f [<.xtc/.trr/...>]] [-n [<.ndx>]] [-s [<.tpr>]]
[-o [<.xvg>]] [-oc [<.xvg>]] [-of [<.xvg>]] [-b <time>]
[-e <time>] [-dt <time>] [-[no]w] [-xvg <enum>]
[-d <string>] [-sl <int>] [-cb <int>] [-ce <int>]
[-tz <real>] [-[no]spherical] [-ng <int>] [-[no]correct]


gmx potential computes the electrostatical potential across the box. The potential is
calculated by first summing the charges per slice and then integrating twice of this
charge distribution. Periodic boundaries are not taken into account. Reference of
potential is taken to be the left side of the box. It is also possible to calculate the
potential in spherical coordinates as function of r by calculating a charge distribution
in spherical slices and twice integrating them. epsilon_r is taken as 1, but 2 is more
appropriate in many cases.


Options to specify input files:

-f [<.xtc/.trr/...>] (traj.xtc)
Trajectory: xtc trr cpt gro g96 pdb tng

-n [<.ndx>] (index.ndx)
Index file

-s [<.tpr>] (topol.tpr)
Portable xdr run input file

Options to specify output files:

-o [<.xvg>] (potential.xvg)
xvgr/xmgr file

-oc [<.xvg>] (charge.xvg)
xvgr/xmgr file

-of [<.xvg>] (field.xvg)
xvgr/xmgr file

Other options:

-b <time> (0)
First frame (ps) to read from trajectory

-e <time> (0)
Last frame (ps) to read from trajectory

-dt <time> (0)
Only use frame when t MOD dt = first time (ps)

-[no]w (no)
View output .xvg, .xpm, .eps and .pdb files

-xvg <enum>
xvg plot formatting: xmgrace, xmgr, none

-d <string> (Z)
Take the normal on the membrane in direction X, Y or Z.

-sl <int> (10)
Calculate potential as function of boxlength, dividing the box in this number of

-cb <int> (0)
Discard this number of first slices of box for integration

-ce <int> (0)
Discard this number of last slices of box for integration

-tz <real> (0)
Translate all coordinates by this distance in the direction of the box

-[no]spherical (no)
Calculate spherical thingie

-ng <int> (1)
Number of groups to consider

-[no]correct (no)
Assume net zero charge of groups to improve accuracy


· Discarding slices for integration should not be necessary.

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