For the emf terminal, special points are implemented.

/ A few special point types /
1496 if (69 <= number && number <= 73) {
1497 int emf_color_save = emf_color;
1498 emf_color = emf_background;
1499 switch (number) {
1500 case 69: EMF_point(x,y,4); break;
1501 case 70: EMF_point(x,y,6); break;
1502 case 71: EMF_point(x,y,8); break;
1503 case 72: EMF_point(x,y,10); break;
1504 case 73: EMF_point(x,y,12); break;
1505 }
1506 emf_color = emf_color_save;
1507 switch (number) {
1508 case 69: EMF_point(x,y,3); break;
1509 case 70: EMF_point(x,y,5); break;
1510 case 71: EMF_point(x,y,7); break;
1511 case 72: EMF_point(x,y,9); break;
1512 case 73: EMF_point(x,y,11); break;
1513 }

would the above be a hint the feature implementation?