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I'm confused about how the predictions of this graph were formed.

I have this formula:

But the change in frequency per second is about : 2x 10^-12 which has a problem because when you multiply this by 10 years you don't even get a change of frequency of 1/1000 of a second and in the graph it says it's around 5 seconds.

Anyone know what I'm doing wrong?

Paper: https://arxiv.org/pdf/1011.0718v1.pdf

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# I By what formula is this graph predicted? Cumulative Periastron Time Shift

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