It should be noted that the number of grid points in the TABLE file
should not be less than the number of grid points DL_POLY_2 is expecting.
(This number is given by the parameter mxgrid in the DL/SMALL>_PARAMS.INC file - see section 8.1.1.) DL_POLY_2 will
re-interpolate the tables if ngridmxgrid, but will
abort if ngrid
mxgrid.
The potential and force tables are used to fill the internal arrays
vvv and ggg respectively (see section 2.3.1). The
contents of force arrays are derived from the potential via the
formula: