What is Combo? Combined ETF + Index Data SpotGamma combines the S&P500 (SPY+SPX), Nasdaq (QQQ+NDX), and Russell (RUT+IWM) to derive "combined" trading levels for the entire index complex. This is important as the ETF + Index will trade in line with each other, so the combined data provides a comprehensive model of the total options exposure. Related articles How to read Bookmap CloudNote Levels What are Zero Gamma Levels? What are Options Liquidity Providers? What is a Put Wall? How do I switch to ES Emini Futures on TradingView?