Cumulative delta divided by cumulative volume; 0 before any volume.
Intrabar running delta extremes, including initial zero; null without trade-path metadata.
Session letter of the period the bar opens in: A for the first tpoMinutes, and so on.
Null when a legacy input does not include an actual trade count.
Cumulative volume over the loaded bars, restarting with
cvdReset: 'session'.