Channels

Aumkar

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Hello All

I was reading Come into my Trading Room by Alexander Elder.
In that he talks about Price Channels/Envelopes. What channels is he talking about?

What are the different types of channels/envelopes apart from Bollinger Bands?
 
From googling, it appears that they are simply lines drawn parallel to a moving average. Unlike Bollinger Bands, they don't express volatility so well.
 
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