tab_double (t, 1, heading_rows, 0, ssq, NULL);
tab_double (t, 2, heading_rows, 0, df, wfmt);
tab_double (t, 3, heading_rows, 0, ssq / df, NULL);
tab_double (t, 1, heading_rows, 0, ssq, NULL);
tab_double (t, 2, heading_rows, 0, df, wfmt);
tab_double (t, 3, heading_rows, 0, ssq / df, NULL);