Scheme shamelessly stolen from BORC. A pretty depiction of bollinger bands. Short basis plots from 5., 1, 2 (lines) deviations and then 2, 2.5, 3 (colored bands). Long basis plots only the basis, and 2, 2.5 and 3 bands (gray).
Open-source script
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules.
You can favorite it to use it on a chart.
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