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mlab.psd should probably just be calling np.fft.fftfreq here.
In [1]: import numpy as np
In [2]: import matplotlib.pyplot as plt
In [3]: pxx, f = plt.psd(np.ones(1025), 1025, 10e3, sides='twosided')
In [4]: f
Out[4]:
array([-5004.87804878, -4995.12195122, -4985.36585366, ..., 4965.85365854,
4975.6097561 , 4985.36585366])
In this example I have set Fs = 10 kHz, meaning that the highest frequency can't be any larger in than 5 kHz.
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