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Table 25
Reserved spectral coordinate type codes1
| Code | Type | Symbol | Assoc. variable | Default units |
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| FREQ | Frequency | ν | ν | Hz |
| ENER | Energy | E | ν | J |
| WAVN | Wavenumber | κ | ν | m-1 |
| VRAD | Radio velocity2 | V | ν | m s-1 |
| WAVE | Vacuum wavelength | λ | λ | m |
| VOPT | Optical velocity2 | Z | λ | m s-1 |
| ZOPT | Redshift | z | λ | ... |
| AWAV | Air wavelength | λ a | λ a | m |
| VELO | Apparent radial velocity | v | v | m s-1 |
| BETA | Beta factor (v / c) | β | v | ... |
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