In a grid calculation the step size in degrees or Ångstroms for the
first of the two parameters is given by *n*.*nnn*. By default, an 11 by 11
grid is generated. See `POINT1` and `
POINT2` on how to adjust this number.
The first point calculated is the supplied geometry, and is in the upper
left hand corner. See also `STEP2=`*n*.*nnn*.