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The parameters that are commonly shared are:
- Parameters Name: This should be a unique and descriptive identifier for the Science Parameters.
- Cycle Time: How often this calibrator should be observed. Once the time since the beginning of the last scan of this calibration has exceeded the cycle time, a new scan will be scheduled once the current subscan has ended.
- Default Integration Time: A nominal time for observing this calibrator. This will in general be exceeded as a subscan (for pointing observations a group of subscans), once started, must be completed. Might one day be overridden by the time taken to achieve some level of calibration accuracy.
- Data Origin: Type of data to use for deriving the calibration - the channel average data will often be used.
- Sub Scan Duration: This has a similar meaning to that for science observations i.e. the integration time will be made up of one or more subscans and, once a subscan has started, it will be completed. In addition, for calibrations that only make sense with some number
of distinct observations e.g. a five-position pointing, the subscan duration sets how long the telescope points at each position and an integer number of
subscans will always be observed. The subscan duration must be an integer multiple of the integration duration and 48 ms.
- Force Atmospheric Calibration: Whether a system temperature measurement is needed will often be determined by the observing script, but checking this will ensure what one is taken every time the science Target is observed.
- Force Execution: It is possible that a calibration Target will not actually be observed as the script may decree that it is not necessary e.g. a sufficient calibration exists from a previously-executed SB. This can be overridden using this checkbox.
- Advanced Parameters: Not yet implemented.
Amplitude, phase, delay and sideband ratio calibrations only use the above parameters.
Next: Phase-only Parameters
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The ALMA OT Team, 2018 Sep 25