National Radio
Astronomy Observatory

5.2.7 Parameter restfreq

The value of the restfreq parameter, if set, will over-ride the rest frequency in the header of the first input MS to define the velocity frame of the output image.

ALERT: The restfreq parameter takes the options of transitions and frequencies as in the corresponding plotxy parameter (§ 3.3.2.12), but the frame information is controlled under the mode parameter (§ 5.2.5).

For example:

will set the rest frequency to that of the CO 1-0 line.

ALERT: Setting restfreq explicitly here in clean is good practice, and may be necessary if your MS has been concatenated from different files for different spectral windows (§ 2.2.10).

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