tab_joint_text(self->t,2,0,6,0,TAB_CENTER,_("Paired Differences"));
tab_box(self->t,-1,-1,-1,TAL_1, 2,1,6,vsize-1);
tab_box(self->t,-1,-1,-1,TAL_1, 6,0,hsize-1,vsize-1);
tab_joint_text(self->t,2,0,6,0,TAB_CENTER,_("Paired Differences"));
tab_box(self->t,-1,-1,-1,TAL_1, 2,1,6,vsize-1);
tab_box(self->t,-1,-1,-1,TAL_1, 6,0,hsize-1,vsize-1);