My preferred usage is to stick with 20ma and adjust the legnth of the period. Shown here is 20ema of 10day period.
More information can be learnt from 'endlessmountain' on youtube but only the very top and bottom levels are used with the High, Low & Close. Also i am not aware if this originates from any other source.
Thankyou to Clarke Moody and endlessmountain. Hope you like this tool.
Update: With interest gaining from the community i have decided to publish what is in my opinion a better version.
Upper and lower levels are now multiplications of 1.272 (square root of 1.618). See script fo