Principal apertures	Secondary apertures	Particular  apertures
125.00	112.00	38.20
100.00	90.00	19.00
80.00	71.00	13.20
63.00	56.00	9.50
50.00	45.00	6.70
40.00	35.50	4.75
31.50	28.00	3.35
25.00	22.40	2.36
20.00	18.00	1.70
16.00	14.00	1.12
12.00	9.00
10.00	7.10
8.00	5.60
6.30	4.50
5.00	3.55
4.00	2.80
3.15	2.24
2.50	1.80
2.00	1.40
1.60	1.18
1.25
1.00

Principal apertures	Secondary apertures	Particular apertures
800	900	850
630	710	600
500	560	425
400	450	300
315	355	212
250	280	150
200	224	106
160	180	75
125	140	53
100	112	38
80	90
63	71
50	56
40	45
32	36
25
20