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I think that what you are seeing here in the second plot is Gibbs' noise (https://en.wikipedia.org/wiki/Gibbs_phenomenon). Your plot looks a lot worse than what I get when running this: but the issues are still present here. In particular:
(this is a time-domain waveform, so it starts abruptly in the time, not the frequency, domain). Using PhenomD: Still has some Gibbs noise from the abrupt start of that waveform in the frequency domain.
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Hi,
I have a doubt about the get_inspiral_tf function.
In theory, this should output the TF evolution of a signal given the approximant, but it is not clear to me what it really does because I get some inconsistencies.
For example, I generate the TF evolution of a signal in this way
time_tf, tf_evo = get_inspiral_tf(time, 30, 30, spin1 = 0, spin2 = 0, f_low = 20, n_points=2000, pn_2order=7, approximant='TaylorF2')
And get the following plot
![plot](https://private-user-images.githubusercontent.com/72254807/317196019-fec95ecc-a775-4751-867d-4909a586efbf.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.WUnbwhDaG_mesusPC_p2iCIFfa6zOVwbtna5Vx0gbo0)
For what I understand, this is a signal that lasts about 0.8 seconds with a frequency sweep up to 70 Hz.
Then, I generate a TD signal and plot it
I get this:
That is a waveform that, up to merger lasts almost 5 seconds. Which is the difference between the two outputs?.
Please note that, if I transform the latter into a frequency series and/or generate a wf in FD, I correctly get frequencies up to 70 Hz.
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