In output the program writes one file: title_ebas.sbf or title_ras.sbf according to the chosen function to be used by pop09 and one input file for bas09 named temp.bas. The temp.bas file corresponds to the input attractor mode, it can be generated with a different wave function (for example with a smaller basis set) which nevertheless yields the same overall topology and without grid point assignment. In this case it is not necessary to run grid09 before. This procedure is recommended for large systems. Do not forget to update the wfn file name in temp.bas if another wfn file is used.