VIX‑Based σ‑Bands

This Pine Script v5 indicator builds a volatility‑based envelope around yesterday’s close using CBOE’s volatility indices. It dynamically pulls VIX, VXN, VXD or RVX—depending on whether you’re charting ES, NQ, YM or RTY—and converts annualized volatility into dollar‑move bands at ±¼ σ, ±½ σ, ±1 σ, and ±2 σ. Optional “mid‑lines” fill in the gaps between each band for even finer precision.