Fibonacci Fan as a line instrument is built as follows: a trend line — for example from a trough to the opposing peak is drawn between two extreme points. Then, an "invisible" vertical line is automatically drawn through the second extreme point. After that, three trend lines intersecting this invisible vertical line at Fibonacci levels of 38.2, 50, and 61.8 percent are drawn from the first extreme point.
These lines are considered to represent support and resistance levels. For getting a more precise forecast, it is recommended to use other Fibonacci instruments along with the Fan.