tab_headers (t, 0, 0, 1, 0);
tab_box (t, TAL_1, TAL_1, -1, TAL_1, 0, 0, tab_nc (t) - 1, tab_nr (t) - 1);
tab_hline (t, TAL_2, 0, 1, 1);
tab_headers (t, 0, 0, 1, 0);
tab_box (t, TAL_1, TAL_1, -1, TAL_1, 0, 0, tab_nc (t) - 1, tab_nr (t) - 1);
tab_hline (t, TAL_2, 0, 1, 1);