Including S preevent noise in the denominator during wiener deconvolution

[jaredbryan881]

I'm just curious why the denominator in the Wiener deconvolution doesn't include preevent noise spectra from the S components as in Audet (2010).

RfPy/rfpy/rfdata.py

Lines 737 to 744 in 5b4b26b

	# Auto and cross spectra
	Spp = np.sum(np.real(Fp*np.conjugate(Fp)), axis=0)
	Sd1p = np.sum(Fd1*np.conjugate(Fp), axis=0)
	Sd2p = np.sum(Fd2*np.conjugate(Fp), axis=0)
	Snn = np.sum(np.real(Fn*np.conjugate(Fn)), axis=0)
	# Denominator
	Sdenom = Spp + Snn