I don’t know for sure, bu as the name implies and after some computations, that value is the variation of the closing price (or current one if the candle is not yet closed) compared to that of the previous candle. For TFs < daily there is one more detail: Variation compared to the previous day.
It’s just a set of percentages to help traders with ready-to-use data, in case they might be interested (sort of “courtesy by PRT”).
Roberto
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