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sc.BaseData[SC_ASKBID_NUM_TRADES_DIFF_HIGH]: The array containing the maximum difference between the number of trades at the Ask price or higher and the number of trades at the Bid price or lower, for the bar at the specified Index. This is calculated at every tick during the creation of the bar. For the data in this array to be accurate, the Intraday Data Storage Time Unit setting in Global Settings >> Data/Trade Service Settings must be 1 Tick. The data in this array will not be available for historical data that does not have Ask and Bid volume.
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_ASKBID_NUM_TRADES_DIFF_LOW]: The array containing the minimum difference between the number of trades at the Ask price or higher and the number of trades at the Bid price or lower, for the bar at the specified Index. This is calculated at every tick during the creation of the bar. For the data in this array to be accurate, the Intraday Data Storage Time Unit setting in Global Settings >> Data/Trade Service Settings must be 1 Tick. The data in this array will not be available for historical data that does not have Ask and Bid volume.
If you are using this array in your study function, you must set sc.MaintainAdditionalChartDataArrays to 1 in the sc.SetDefaults code block.