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Fix: normalization of power spectra... #15

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@gkBCCN gkBCCN commented Feb 15, 2019

...power spectra should be normalized by T_signal=dt*N_signal.

S(f) = lim T->inf  <XX*>/T    ,  X=FFT(signal) and X* its complex conjugate.

This would give ps = ps / T_signal = ps / (dt*N_signal).
The previous code had ps * dt / N_signal.

...power spectra should be normalized by T_signal=dt*N_signal.
   This would give ps = ps / T_signal = ps / (dt*N_signal).
   The previous code had ps * dt / N_signal.
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