def _write_iop_to_file(self, iop, file_name):
        """Generic iop file writer

        :param iop numpy array to write to file
        :param file_name the file and path to write the IOP to
        """
        lg.info('Writing :: ' + file_name)
        f = open(file_name, 'w')
        for i in scipy.nditer(iop):
            f.write(str(i) + '\n')