After a small research, I see that indicator plots the Point of Control (POC), Value Area High and Value Area Low, and continuously on the chart over the last X periods, so we have a view of their values in the chart history.
Point of Control is the price level for the time period with the highest traded volume .
The area between value area low and value area high (green background) is the area where 70% of traded volume happen. You can customize this percentage value in input section.
I think that it could coded if you need it?
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