vertical separation
| minimum
| vertical separation | |
| transp. avia. | verticale separatie |
| minimum | |
| gen. | kleinst mogelijke hoeveelheid |
| life.sc. environ. | minimale ozonconcentratie |
| med. | minimum |
| nat.sc. | minimum zonnevlekactiviteit |
|
vertical separation : 4 phrases in 2 subjects |
| Construction | 1 |
| Transport | 3 |