RPE % values and coefficients

I am not sure where the % values are coming for RPE and am having trouble finding sources although this table is all over the net. How are the % values derived? “Pyschophysical bases of perceived exertion” Borg 1982 and other literature has peaked my interested. Please share sources related to research resulting in this table.

The values are 100% made up based off user-reported data, which is not controlled.

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Haha! I’ve been having difficulty in adjusting the lighting to accurately measure on the Baraki Exertion Scale. But more seriously, for example, is there an equation for the fit of this curve? Most of the literature I’m interested in is behind paywalls currently. The question is vague but any insights into furthering my understanding and it’s application in my training would be greatly appreciated.