I modified "AC+ GF SD v.01.mq4" to make "HiLoFiboFan.mq4". It's a Fibo Fan.
"AC+ GF SD v.01.mq4" is a Gann Fan indicator from a Russian coder.

This indicator is better than the "Fibo Fan Day Range.mq4" I did before.
viewtopic.php?p=1295400500#p1295400500

In the following example, we see that NZDCHF
bounced off the gray Fibo 50.0 % for January 7th, 2020.

Also check out some Gann books
Pattern Price and Time Using Gann Theory in TA - Hyerczyk 2009.pdf
viewtopic.php?p=1295382646#p1295382646

Integration Of Gann, Elliott, And Fibonacci - Matske 2002.pdf
viewtopic.php?p=1295382310#p1295382310

Best Gann Fan trading strategy
viewtopic.php?p=1295400637#p1295400637