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sc.BaseData[SC_BIDNT] or sc.NumberOfBidTrades: The array containing the total number of trades at the bid price or lower. For this to work properly, the Intraday Data Storage Time Unit setting in Global Settings >> Data/Trade Service Settings. needs to be 1 Tick. This will also not work on historical data that does not have bid volume. In the case of Tick, Volume, and Range charts, the data in this array may not be correct if Chart >>Chart Settings >> Split Data Records is enabled, unless you are using tick data and the chart is based on Ticks or a Range.

If you are using this array in your study function, you must set sc.MaintainAdditionalChartDataArrays to 1 in the sc.SetDefaults code block.
sc.BaseData[SC_ASKNT] or sc.NumberOfAskTrades: The array containing the total number of trades at the ask price or higher. For this to work properly, the Intraday Data Storage Time Unit setting in Global Settings >> Data/Trade Service Settings needs to be 1 Tick. This will also not work on historical data that does not have ask volume. In the case of Tick, Volume, and Range charts, the data in this array may not be correct if Chart >>Chart Settings >> Split Data Records is enabled, unless you are using tick data and the chart is based on Ticks or a Range.