Notation	Name	Description	Status
1	Height of station		stable
2	Height or altitude		stable
3	Geopotential		stable
4	Pressure		stable
5	Height increment		stable
6	Height above station		stable
7	Height		stable
8	Geopotential		stable
9	Geopotential height		stable
10	Flight level		stable
12	Grid point altitude		stable
21	Elevation		stable
22	Solar elevation		stable
24	Satellite zenith angle		stable
25	Solar zenith angle		stable
26	Satellite zenith angle		stable
30	Height of station ground above mean sea level		stable
31	Height of barometer above mean sea level		stable
32	Height of sensor above local ground (or deck of marine platform)		stable
33	Height of sensor above water surface		stable
35	Maximum size of z-dimension		stable
36	Level index of z		stable
40	Impact parameter		stable
61	Depth below land surface		stable
62	Depth below sea/water surface		stable
63	Depth below sea/water surface (cm)		stable
64	Representative height of sensor above station		stable
65	Water pressure		stable
70	Drogue depth		stable