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From astropy.timeseries
ggamma(N)
sqrt(2 / N) * exp(lgamma(N / 2) - lgamma((N - 1) / 2))
A positive number
Thomas Ruf thomas.p.ruf@me.com
VanderPlas, J. & Ivezic, Z. (2015) Periodograms for Multiband Astronomical Time Series.The Astrophysical Journal 812.1:18
pbaluev
ggamma(3)
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