How these charts work

• By Strike — Call/Put/Net of the selected Greek for the current replay snapshot, windowed to the strikes around spot.
• Evolution — a Time x Strike heatmap of the same Greek across the loaded replay history, with an optional spot price overlay.
• Forward Surface — not historical data. A synthetic Black-Scholes recompute across Days Forward x Future Price, showing what the Greek landscape would look like at future times/prices.
• Use Volume (VEX) — weights by traded volume instead of open interest.