Thanks all.
As a maths teacher, using a common mathematical technique to assist in my hobby is pretty cool. The advantage of linear fitting is two fold; firstly it is linear, as the name suggests, so it doesn’t change the underlying distribution within each master frame, it simply renormalises them to the weakest channel. Secondly it is deterministic, so I could give anyone my raw data and they could apply the same process and produce exactly the same fitted master frames. Or as kind of a 2a, I could take someone else’s data and apply the process to produce very similar master frames to my own.
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