Value = Σ SELL legs − Σ BUY legs × ratio (positive = net credit, white; negative = net debit, green). BUY column = enter at market (pay ask on BUY legs, hit bid on SELL legs); SELL column = reverse. Market closed (equity after 15:30, MCX/NSE commodity after 23:55) or no bid/ask → LTP. Ratio 0 = no leg. Hover a value for its legs. Grey italic = uses a strike with no trade this session (stale LTP); "--" = strike never traded (no OI/volume).