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Hurst Constant Envelope

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This script follows the fundamentals described in J.M. Hurst works.
Constant Envelope is updated version of EMA with its 2 copies drawn with nominal distance from the base.
That make a constant width channels, unlike the standard envelope using the % concept.
Its width is not changed at different price levels.

Notes de version
the Moving average last value is set up to be a half of wave length from the last bar on the chart
so is the default offset

changed shift to width
Notes de version
Added second harmonic envelope, with span 2x basic
Notes de version
Previous version had a mistake in theory, now
The second harmonic is now envelope with half span of the basic. Just as defined in "The Profit Magic Of Transaction Timing"

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