tab_double (t, 6, v * 2 + heading_rows, TAB_RIGHT, 2.0 * (tval > 0 ? q : p), NULL);
tab_double (t, 7, v * 2 + heading_rows, TAB_RIGHT, mean_diff, NULL);
tab_double (t, 6, v * 2 + heading_rows, TAB_RIGHT, 2.0 * (tval > 0 ? q : p), NULL);
tab_double (t, 7, v * 2 + heading_rows, TAB_RIGHT, mean_diff, NULL);