Mm - hmm.
you know , you would want to adjust for that in order to compare things.
Mm - hmm.
And the variance is just sort of like the next moment , you know ? So uh  what if um one set of pictures was taken uh so that throughout the course it was  went through daylight and night uh  um um ten times , another time it went thr I mean i is , you know , how  how much   how much vari