Go short on XAUUSD IF gold stays within 2 standard deviations of the regression channel and AFTER gold drops below 4 hour parabolic SAR as pictured in this 4 hour, 2 standard deviation regression channel.
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This is an excellent example of the importance of using trigger filters. The underlying did not stay within 2 SD and did not break below SAR. At some point a wedge would have formed between SAR and the upper channel line for a decision point.