Personalized version of the Generalised Lomb-Scargle periodogram with just some plot tweaks and more input/output options.
This is the GLS from the original repository of GLS except for a few extra lines of code, I do not mean to steal or get credit for other people's work.
Please cite M. Zechmeister & M. Kürster, The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms, 2009, A&A, 496, 577 [pdf, bibtex]