Market Profile TPO (Time Price Opportunity) letter structure. Visible chart window range selection. Segmentation by two custom sessions with two instances. 30-minute TPO. Non-sequential character sequences. Initial Balance (IB). Point of Control (TPOC), start and end indication on object. Median by line. First instance with Value Area (VA) indication by marker box and on object. 0:25 Instances with sequential character sequences. 1:05 Segmentation by two custom sessions with one instance.