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Hi Orestis,
That's some report you've posted. Extensive range of DSO's beautifully descriptive.
One suggestion for your long range brightness gauge, in one corner of the sketch do a graded scale of the media you used from 'lightest tn darkest'. It will give you a constant "standard" by which to determine any changes as we cannot reliably trust our eyes and touch over time. Add this scale to each such 'time' sketch.
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