[EquisMetaStock Group] How to write a bands indicator builder?

[sdjsony <no_reply@xxxxxxxxxxxxxxx>]

Dear Members,
 
I want try to make Average True Range bands in indecator builder.
I have idea on upper band and lower band now, but i don't know how to 
apply this two formula.

How can i apply two formula in indecator builder?
 
pls help

Thanks you very much


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