STEP1=n.nnn

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.