I want to create a trendline like the image above, which is used in a small timeframe. Can anyone share it with me so that I can understand it?
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It seems to me a regression channel. If it is really what you want, you first need to defined two points (i.e. shift / bar no / candle no).
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@fxdreema_acc If that that is a channel, you will need this block:

And as sktsec said, you will have to select two candle sticks to define it.