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It is possible to observe by reading out only one CCD (CCD1) instead of all four. This mode is called 90PrimeOne and is started from a different icon on the AzCam computer's desktop.
In 90PrimeOne mode, only CCD1 is readout. Make sure to initialize the telesocpe using CCD1 only!
Note the WCS and Pointing Differences between 90Prime mode and 90PrimeOne mode.