LATTICE,[INFILE=input_file,][OUTFILE=output_file,] [VARGRAD,][NUCONLY,][REMOVE]
A lattice of point charges is included in the calculation through the use of this card. An external file (input_file) should be given as input, with the following format:
Comment line
number of point charges N
flag
flag
The and fields stand for the point charge coordinates (in Å), for its charge and flag=1 indicates that gradients should be computed for this lattice point (0 means no gradient).
outfile specifies a file name to which the lattice gradient is written; if blank, it will be written to the output stream.
Symmetry is not supported for lattice gradients.