$GRID group     (not required)
 
    This group is used to input a grid (plane or cube) on
which properties will be calculated.  This group should be
given if WHERE=GRID in $ELPOT or $ELDENS.  This output will
be in the PUNCH file whenever OUTPUT=PUNCH or BOTH.
 
MODGRD    = 0 orthonormalize the grid vectors
          = 1 normalize the grid vectors
ORIGIN(i) = coordinates of one corner of the grid/cube.
XVEC(i)   = vector from ORIGIN to an adjacent corner "X" of
            the grid (or cube).  The XVEC direction need
            not be parallel to the X-axis of the molecule.
YVEC(i)   = vector to the adjacent corner "Y" of grid/cube.
ZVEC(i)   = vector to the adjacent corner "Z" of the cube,
            given if and only if MODGRD=1.
SIZE      = grid increment in all directions (default 0.25)
UNITS     = units of the above five values, it can be
            either ANGS (the default) or BOHR.
GRDPAD    = grid padding, like GRDPAD in $FMOPRP, but
            applied to non-FMO runs. Default: 0, which
            means padding is not used so one must specify
            ORIGIN.
 
Two dimensional grids may be drawn with the graphics
program MEPMAP provided with GAMESS.  Several programs will
accept the 3-dimensional CUBE format.
 
Note that MacMolPlt draws 2D and 3D density maps without
any need to pre-compute them inside GAMESS by this group.
 
User *must* input orthogonal XVEC/YVEC/ZVEC directions!
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