HLO3 ProphetX Chart Studies - HLO3 Menu Getting Started Training Online Training Quick Start Videos Product Details Content Library DTN Grain Bids DTN FastRack FAQ DTN Refined Fuel Demand Data FAQ DTN Weather Field Descriptions Excel Add-in Field Descriptions Commodity Month Codes Common Symbols Argus Symbols EIA Short Term Energy Outlook EOX Live Symbol Changes OPIS Rack Symbols Total Volume and Open Interest USDA Symbols ProphetX Symbology Notices Notices System Status Release Notes Symbol Search Contact Us Contact Us ProphetX Feedback The HLO3 study will average the High, Low, and Open elements Parameters: Symbol — data source symbol.