band with indicator

You can use this code:

(BBandTop(C, 20, S, 2) - BBandBot(C, 20, S, 2))/Mov(C,20,S) *100

It uses the default 20-period, 2-standard deviation settings, which obviously you can change.
 
click on B:
http://trader.online.pl/MSZ/!-MSZ-index-en.html
 
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