OPEN-SOURCE SCRIPT
GBT Tunnel
This is a channel type tool I created, heavily influenced by LazyBear COG Fibs script and the COG Fibs script by Joy_Bangla which also uses LazyBear COG Fib logic. All credit to those guys, publishing this open source as well since its nothing here is my original work really.
Release Notes
clean up code, fix display label text 
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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 publications is governed by House rules. You can favorite it to use it on a chart.
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