Volume Trend Delta Indicator

Hello All, I have noticed recently that new indicator “Volume Trend Delta” has been introducd to dhan’s platform. I am curious to know that, is the Delta showing as Histogram derived from live data(actual total buy - total sell) or is it derived from jus normal calculation with no relation yo live data? Or any other way?

Kindly answer my query.

I really appreciate your quick turn around.

Thanks,

Umesh Vadla