tab_box (table, TAL_2, TAL_2, TAL_0, TAL_1, 0, 0, cols -1, rows -1 );
tab_hline (table, TAL_2, 0, cols - 1, 1);
tab_vline (table, TAL_2, 2, 0, rows - 1);
tab_box (table, TAL_2, TAL_2, TAL_0, TAL_1, 0, 0, cols -1, rows -1 );
tab_hline (table, TAL_2, 0, cols - 1, 1);
tab_vline (table, TAL_2, 2, 0, rows - 1);