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Registry board question

I only have two sets up on the registry, so I am kind of new at this, please forgive me it this is a stupid question.
I understand the first 6 columns on the registry set listings (image, item, PCGS#, date, denom, grade).
But the next few columns confuse me.
I get the 7th column (PCGS# pop) and the 8th column (PCGS# pop higher), but what does the 9th and 10th column (pop & pop higher) refer to?
Are these incorporating populations from other TPG, or estimates of old collections prior to PCGS?

To me, the 9th and 10th column numbers appear to be either redundant or otherwise useless information. Why are they there?


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