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You have to wait until readout, when the exposure has finished. Depends on the software package that you're using as to how you go about it. With MaxIM DL you can either put your curser over a star and it'll display the ADU count down towards the bottom right of the screen, or you can open the "Toggle Information" tab, put it on aperture and select a star.
In SGP you put your curser over an area and look at the 21x21 box information.
In Nebulosity there is a pixel information tab that can be used.
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