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Dynamic X-ray power density spectrum of M82 

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The two horizontal (dotted) lines are 99.73% and 99.99% confidence contours. 

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You can see a feature at <c.highlight>5 Hz</c> reaching statistically significant levels

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Notice the overall noise decrease and the second feature at <c.highlight>3.3 Hz</c>

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You can now see the twin QPO pair.