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Four panels for the four basebands will be visible and one spectral window can be added to each. Adding a spectral window is done either by selecting spectral lines from the spectral line catalogue or by adding them manually. One of the spectral windows should be selected as that which will set the Representative Frequency. This defaults to the centre of the spectral window, but can be changed at the bottom of the page. This sets the size of the antenna beams drawn in the Visual Spatial Editor and is also used to work out the time estimate for the Science Goal.
- Select Lines to Observe in BaseBand...: Opens the Spectral Line Selection Tool allowing a huge list of transitions to be searched.
- Add: Add a blank row to the table that can then be completed manually.
- Delete: Delete the selected row from the table.
Figure 5.6:
The spectral window table for a single baseband.
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The spectral window table has the following columns. Most accept input by being double-clicked.
- Fraction: Indicates what fraction of the available correlator hardware this spectral window should use. This is currently fixed to ``Full'' i.e. 100%.
- Centre Freq Rest: The centre rest frequency of the window.
- Centre Freq Sky: The centre sky frequency of the window.
- Transition: A standard name for a spectral line transition, usually entered by the Spectral Line Selection Tool. Any label that is useful to the user can be entered here, but standard ASCII characters should be used.
- Bandwidth, Resolution: The bandwidth and spectral resolution of the window - each equals a correlator mode. Only allowed modes may be chosen from a drop-down list. The resolution is calculated assuming Hanning smoothing i.e. twice the channel spacing. This is applied by default to all data. The correlator modes in bold font have lower resolution and can be used to observe continua or broad spectral lines.
- Representative Window: Select one of the spectral windows to set the Representative Frequency.
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The ALMA OT Team, 2013 Feb 27