Altitude above sea level in classes of 200 m. Reference: Digital height model DHM 25 from Swisstopo

Code	Text	NFI1	NFI2	NFI3	NFI4	NFI4b	NFI5
-1	n/a	x	x	x	x	x	x
1	>1800 m	x	x	x	x	x	x
2	1601-1800 m	x	x	x	x	x	x
3	1401-1600 m	x	x	x	x	x	x
4	1201-1400 m	x	x	x	x	x	x
5	1001-1200 m	x	x	x	x	x	x
6	801-1000 m	x	x	x	x	x	x
7	601-800 m	x	x	x	x	x	x
8	≤600 m	x	x	x	x	x	x