Session Range Zones – Professional Edition

OVERVIEW Professional visualization of the classic opening-range / Initial Balance concept across Asian, London, and Regular (US) sessions. Displays the high/low of the user-defined opening window as thick, hierarchical filled zones with optional Fibonacci and standard-deviation extensions plus full alerting.

CONCEPT BACKGROUND Using the high and low of the first 30–60 minutes of a session as key support/resistance is public-domain knowledge that has been standard in institutional trading for decades (Initial Balance, Opening Range, Session Range, etc.).

IMPLEMENTATION & VALUE ADDED This indicator follows the established, public-domain range-calculation methodology but has been completely rewritten with the following original enhancements: • Clean, filled High / Mid / Low zones for instant visual hierarchy • Intuitive Asian / London / Regular session labelling and fully custom timing • Comprehensive dynamic & static Fibonacci and 50%/100% standard-deviation extensions • Alert conditions on every zone, midline, opening level, and extension line • Modern, modular code architecture using arrays and custom drawing functions • No repainting, lightweight performance on any intraday timeframe