What does each axis on the HIRO Price Chart represent? The left Y axis is the stock price, the right Y axis is the HIRO value. The HIRO value is a dollar notional value based on a proprietary, delta- based calculation. SpotGamma Alpha subscribers can access the SpotGamma HIRO Indicator here. Related articles What does the sliding scale in the “HIRO by Sector” section indicate? What does each line on the Stock Price Chart represent? What does the "HIRO by Sector" section represent? How can I use the SpotGamma HIRO to help me trade? What does the number beside the sliding scale in the “HIRO Signal” column indicate?