Definition. A heatmap of gamma exposure across strike prices over the last 90 days, used to identify gamma walls, negative GEX clusters, and gamma flip points.

Technical. Strikes are bucketed into 100 logarithmically-spaced bins.

Interpretation. Green zones mark positive GEX where dealers are long gamma and hedging dampens volatility, red zones mark negative GEX where dealers are short gamma and hedging amplifies moves.