Price Retracements are used to specify horizontal lines at price levels, which are determined to be probable values of support and resistance based on a market’s previous range. 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/levels/price-retracements