| CLASS name | Unit | Translation | Notation |
| nchan | — | Number of channel | — |
| rchan | — | Reference channel |
|
| restf | MHz | Tuned signal rest frequency |
|
| image | MHz | Tuned image rest frequency |
|
| fres | MHz | Observatory channel spacing |
|
| vres |
|
Velocity channel spacing |
|
| voff |
|
source systemic velocity |
|
| doppler | — | Doppler factor |
|
Table
describes the CLASS header parameters used to
describe the frequency/velocity axes and their translation in this
document. The signal and image frequency axis are given in the source (rest) frame
by