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+# Ehlers Smoother Momentum Professional
+
+## 1. Summary (Introduction)
+
+The Ehlers Smoother Momentum Pro is a versatile oscillator that applies one of John Ehlers' advanced filters—the **SuperSmoother** or the **UltimateSmoother**—to a **momentum source (Close - Open)** instead of the price.
+
+While the standard `Ehlers_Smoother_Pro` provides a smoothed representation of the trend, this indicator isolates and smooths the bar-by-bar momentum. The user can choose which smoothing engine to use, allowing for a trade-off between responsiveness and smoothness in the final oscillator.
+
+* **SuperSmoother Mode (Default):** Creates an exceptionally smooth momentum oscillator that is excellent for identifying the main momentum swings while filtering out minor noise. Its zero-crosses are reliable, albeit slightly lagging, timing signals.
+* **UltimateSmoother Mode:** Creates a faster, more responsive momentum oscillator with near-zero lag, which reacts very quickly to changes in momentum.
+
+## 2. Mathematical Foundations and Calculation Logic
+
+The indicator is a smoothed average of the `Close - Open` value of each bar, using one of two advanced recursive filters.
+
+### Calculation Steps (Algorithm)
+
+1. **Calculate Momentum Source:** For each bar, the source data is calculated as `Momentum = Close - Open`.
+2. **Apply Ehlers Smoother:** A SuperSmoother or UltimateSmoother filter is calculated on this `Momentum` data series, based on the user's selection.
+
+## 3. MQL5 Implementation Details
+
+* **Unified Calculator (`Ehlers_Smoother_Calculator.mqh`):** This indicator uses the exact same, powerful calculator engine as the `Ehlers_Smoother_Pro`. The only difference is that it is initialized in `SOURCE_MOMENTUM` mode.
+* **Heikin Ashi Integration:** The indicator fully supports calculation on smoothed Heikin Ashi data (`HA Close - HA Open`).
+* **Stability via Full Recalculation:** The indicator employs a full recalculation on every `OnCalculate` call to ensure the stateful, recursive calculation is always stable.
+
+## 4. Parameters
+
+* **Smoother Type (`InpSmootherType`):** Allows the user to select the filter for the momentum calculation: `SUPERSMOOTHER` or `ULTIMATESMOOTHER`.
+* **Period (`InpPeriod`):** The critical period of the selected filter, which controls its smoothing and responsiveness.
+* **Candle Source (`InpCandleSource`):** Selects between `Standard` and `Heikin Ashi` candles for the `Close - Open` calculation.
+
+## 5. Usage and Interpretation
+
+The Ehlers Smoother Momentum is a zero-mean oscillator used for identifying momentum shifts and potential reversals.
+
+### Standalone Usage
+
+* **Zero-Line Crossover:** This is the primary signal.
+  * A cross **above the zero line** indicates that bullish momentum is taking control.
+  * A cross **below the zero line** indicates that bearish momentum is dominant.
+  * The **SuperSmoother** mode provides smoother, more confirmed crossover signals, while the **UltimateSmoother** mode provides faster, earlier signals.
+* **Divergence:** Divergences between the price and the oscillator are powerful reversal signals, particularly clear in the smoother SuperSmoother mode.
+
+### Combined Strategy with Ehlers Smoother (Primary Use)
+
+This oscillator is designed to be used in conjunction with its companion indicator, the `Ehlers_Smoother_Pro`.
+
+* **The Zero-Cross Predicts the Smoother's Turning Point:**
+  * **Buy Signal:** When the **Smoother Momentum** line crosses **above the zero line**, it signals that the `Ehlers Smoother` on the main chart is forming a **trough (a bottom)**.
+  * **Sell Signal:** When the **Smoother Momentum** line crosses **below the zero line**, it signals that the `Ehlers Smoother` is forming a **peak (a top)**.
+
+This strategy allows a trader to use the momentum oscillator as a **leading indicator** to anticipate the turning points of the smoother, lagging filter on the price chart.