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8↔20 EMA Cross with 100‑EMA Trend – NY Session

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What each EMA does 🎯
EMA Typical look-back Role in the setup
8-EMA ~ 2 trading days on a 5-min chart (8 recent closes) Trigger line – reacts quickest to price; defines very short-term momentum.
21-EMA ~ 1 trading week on a 5-min chart Signal line – smooths noise; confirms momentum once it persists a bit.
100-EMA Varies with timeframe (≈ one month of 5-min data) Trend filter – separates bullish from bearish regimes so you only trade in the dominant direction.

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