Fibonacci Fans are used to draw a fan of angled lines that are probable values of support and resistance based on a market range. You have complete control over the percentage values used in the Fibonacci Fans tool and the colours of each of the Fibonacci Fan line. Common values are the Fibonacci sequence 38.2%, 50% & 61.8%. These are used as the default values in Optuma.
This is a companion discussion topic for the original entry at https://www.optuma.com/kb/optuma/tools/fibonacci/fibonacci-fan