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Hi Darren
Here are a couple of screen prints of a 3 min raw exposure of M83 from the software applications MIRA AP and CCDSoft. There are a lot of measurement tools available in these apps, most of them are a mystery to me, but if you want to take it any further, you are most welcome to drop by and explore their potential.
The important thing about the raw file is that it has not been modified in a non-linear manner, so absolute measurements can be taken after darks and flats are applied.
Cheers
Dennis
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