tab_text (this->t, 1, 0, TAB_CENTER | TAT_TITLE, _("N"));
tab_text (this->t, 2, 0, TAB_CENTER | TAT_TITLE, _("Mean"));
tab_text (this->t, 3, 0, TAB_CENTER | TAT_TITLE, _("Std. Deviation"));
tab_text (this->t, 1, 0, TAB_CENTER | TAT_TITLE, _("N"));
tab_text (this->t, 2, 0, TAB_CENTER | TAT_TITLE, _("Mean"));
tab_text (this->t, 3, 0, TAB_CENTER | TAT_TITLE, _("Std. Deviation"));