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- Overlays
- Receiver Bands: Displays the available receiver bands as a hatched bar along the top of the display.
- Transmission: Display the atmospheric transmission curve. This will change depending on what is selected for the Water Vapour Column Density.
- DSB Image: For DSB receivers (bands 9 and 10) this displays the ``image'' counterpart of each spectral window. The image spectral window lies in the other sideband (equidistant from the LO1 frequency) and will show sources of contamination or excess noise e.g. other lines and atmospheric absorption, that will also affect the requested spectral window.
- Spectral Lines: Display lines selected with the Spectral Line Picker.
- Select Lines to Overlay: Choose lines to overlay using the Spectral Line Picker.
- Spectral Scan
- Requested scan: Show the range over which the spectral scan was supposed to cover. This will rarely exactly correspond to what was achieveable in practice.
- Tuning 1, 2, etc.: Display the spectral windows corresponding to a specific tuning. Each tuning is coloured differently and is offset vertically.
- Water Vapour Column Density
- Automatic Choice: Allow the OT to automatically select the appropriate value of PWV according to the Representative Frequency and draw the corresponding transmission plot. This is recommended.
- Manual Choice: Override the OT's choice. This is for experimentation only - the OT will ignore this when calculating the time required for a Science Goal.
- Viewport
- Pan To Spectral Window: This will centre the visualiser on the currently selected spectral window.
- Zoom To Band: Zoom to the current receiver band.
- Reset: Reset the display settings.
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The ALMA OT Team, 2017 Dec 18