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# Channels
Channels define dynamic support and resistance. Upper band shows where price tends to find resistance; lower band shows support. Width measures volatility; price position within channel measures momentum and mean-reversion potential.
## Indicators
| Indicator | Full Name | Description |
| :--- | :--- | :--- |
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| [ABERR](aberr/Aberr.md) | Aberration Bands | Absolute deviation-based volatility bands. More robust than standard deviation. |
| [ACCBANDS](accbands/Accbands.md) | Acceleration Bands | Volatility-based adaptive channel by Price Headley. Width adapts to momentum. |
| [APCHANNEL](apchannel/Apchannel.md) | Adaptive Price Channel | Channel based on adaptive moving average with volatility bands. |
| [APZ](apz/Apz.md) | Adaptive Price Zone | Double-smoothed EMA volatility channel by Lee Leibfarth. Adapts to recent volatility. |
| [ATRBANDS](atrbands/Atrbands.md) | ATR Bands | ATR-based volatility bands around moving average. |
| [BBANDS](bbands/Bbands.md) | Bollinger Bands | Standard deviation bands around SMA. Classic volatility channel. |
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| [DC](dc/dc.md) | Donchian Channels | Highest high and lowest low over N periods. Turtle trading foundation. |
| [DECAYCHANNEL](decaychannel/DecayChannel.md) | Decay Min-Max Channel | Exponentially decaying min-max channel. Half-life decay toward midpoint. |
| [FCB](fcb/Fcb.md) | Fractal Chaos Bands | Tracks fractal highs and lows. Identifies chaos-based support/resistance. |
| [HWC](hwc/Hwc.md) | Holt-Winters Channel | Triple exponential smoothing channel. Upper/middle/lower bands from level/trend/season. |
| [JBANDS](jbands/Jbands.md) | Jurik Adaptive Envelope Bands | JMA's internal adaptive envelopes. Snap to extremes, decay toward price. |
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| [KC](kc/Kc.md) | Keltner Channel | EMA with ATR bands. Smoother than Bollinger. |
| [MAENV](maenv/Maenv.md) | Moving Average Envelope | Fixed percentage bands around moving average. Simple but effective. |
| [MMCHANNEL](mmchannel/MmChannel.md) | Min-Max Channel | Rolling highest high / lowest low using O(1) monotonic deques. |
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| [PC](pc/pc.md) | Price Channel | Highest high and lowest low. Identical to Donchian Channels. |
| [REGCHANNEL](regchannel/RegChannel.md) | Linear Regression Channel | Linear regression line with standard deviation bands. |
| [SDCHANNEL](sdchannel/SdChannel.md) | Standard Deviation Channel | Moving average with standard deviation bands. |
| [STARCHANNEL](starchannel/StarChannel.md) | Stoller Average Range Channel | SMA with ATR bands. Similar to Keltner but uses SMA instead of EMA. |
| [STBANDS](stbands/Stbands.md) | Super Trend Bands | ATR-based trend-following bands. Flips direction on breakout. |
| [TTM_LRC](ttm_lrc/TtmLrc.md) | TTM Linear Regression Channel | Linear regression with ±1σ/±2σ bands. John Carter. |
| [UBANDS](ubands/Ubands.md) | Ehlers Ultimate Bands | USF-based volatility channel with RMS bands. Zero-lag smoothing by Ehlers. |
| [UCHANNEL](uchannel/Uchannel.md) | Ehlers Ultimate Channel | USF-based volatility channel with Smoothed True Range bands. Zero-lag by Ehlers. |
| [VWAPBANDS](vwapbands/Vwapbands.md) | VWAP Bands | Volume-weighted average price with dual ±1σ and ±2σ standard deviation bands. |
| [VWAPSD](vwapsd/Vwapsd.md) | VWAP Standard Deviation Bands | Standard deviation bands around VWAP. |