Plot equation / clustering of a plot

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Is there any way to get the function or to get only the points in the top of the plot? Consider that the x variable is time (date, seconds) or samples/minute and that the amplitude of the "oscillation" is not fixed. Consider also that the period is not constant.

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I was wondering if there is a built-in function in numpy/matplotlib/pandas libraries. Currently I am finding a math equation that could make it work.



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