def _get_xlsx_kws(self, **kws_usr):
        """Return keyword arguments relevant to writing an xlsx."""
        kws_xlsx = {'fld2col_widths':self._get_fld2col_widths(**kws_usr), 'items':'GO IDs'}
        remaining_keys = set(['title', 'hdrs', 'prt_flds', 'fld2fmt',
                              'ntval2wbfmtdict', 'ntfld_wbfmt'])
        for usr_key, usr_val in kws_usr.items():
            if usr_key in remaining_keys:
                kws_xlsx[usr_key] = usr_val
        return kws_xlsx
Return keyword arguments relevant to writing an xlsx.