The screen shot below shows a 1-tick TF chart with BuySellVolume, along with a corresponding T&S window. The ticks on the chart match T&S. However, there isn't a BuySellVolume plot for every tick. (Or is volume sometimes coming through as 0??)
I tested this with CalculateOnBarClose set to False and then set to True just out of curiosity. The attached screen shot happens to have COBC set to True, though the result was the same in both cases.
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