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If I understand you correctly, then each datapoint (O,D,X,Y) represents one photon hitting a pixel(XY) of a detector (D) during an observation (O). And that pixel may be struck zero, one or many times during a given observation. If it is hit more than once, then there will be multiple, identical, (O.D.X.Y) datapoints in the dataset for that detector/observation pairing?
Is that correct?
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In reply to Re^3: structuring data: aka walk first, grok later