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For the vast majority of projects, standard observatory calibration observing strategies will be perfectly adequate and the first (default) option should be selected. The options are:
- System-defined calibration: The default calibration strategy whereby a single observation of a bright quasar is used to calibrate both the flux scale and the bandpass. A phase calibrator will also be scheduled, as well as a polarization calibrator if full polarization was requested.
- System-defined calibration (force separate amplitude calibration): This is similar to the first option, but differs in that the amplitude (flux) calibration will be done using a separate observation of a solar-system object. Only select this if particularly high amplitude accuracy is required.
- User-defined calibration: If this option is selected, the user can define their own calibration sources. This is not recommended and should only be selected if you really know what you're doing, or if passive phasing for VLBI has been selected in which case a fixed phase calibrator must be defined. All user-defined calibrations must be fully explained in the Technical Justification. The options are:
- Add Dynamic Calibrator...: In this case, the source is chosen at SB execution time based on some criteria (usually a search radius around a position and perhaps a minimum flux constraint) entered by the user.
- Add Fixed Calibrator...: Using this interface a specific calibrator source can be chosen when creating the proposal.
- Delete Selected Calibration: In principle, all calibrations can be deleted, although there must an incredibly good reason for doing that.
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The ALMA OT Team, 2021 Feb 03