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Spectral Scan
It is possible to define a complicated setup involving multiple tunings that are meant to cover a contiguous range in frequency using the spectral scan interface. Given a start and stop frequency, and a correlator mode, the OT will devise a set of tunings that achieve the requested frequency range.
- Requested start frequency (sky): Frequencies can only be entered in the sky (observed) frame.
- Requested stop frequency (sky):
- Requested range (rest): The requested range is also shown in the rest frame of the first target defined in the Field Source editor.
- Achieved scan range (sky): In general, the OT will not achieve the exact frequency range requested and this is displayed here.
- Bandwidth: One of four correlator modes (the four widest available) should be chosen from the drop-down menu. The displayed values of spectral resolution include Hanning smoothing and spectral averaging.
- Spectral averaging: A single spectral averaging factor can be applied to all spectral windows.
- Representative frequency (sky): The default value (centre of requested range) can be changed.
Once enough information has been added, the OT will calculate a tuning setup and display the derived spectral windows. Spectral scans are only allowed of sources with a single offset pointing and only a single 12-m configuration is allowed (no ACA).
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The ALMA OT Team, 2014 May 21