HEAD_SEP
center(lineout, week_len * 3 + HEAD_SEP * 2, 0);
center(month_names[month], week_len, HEAD_SEP);
center(month_names[month + 1], week_len, HEAD_SEP);
HEAD_SEP + (wflag ? WEEKNUMBER_LEN : 0), "", day_headings,
HEAD_SEP + (wflag ? WEEKNUMBER_LEN : 0), "", day_headings);