Frequency spectra and determined fundamental (fund.) orbital frequencies of the orbit of a randomly chosen HS’ star in the fiducial potential (see Appendix A) for an integration time of 100 Gyr, outputted each 10 Myr. The filtered (filt.) spectra for Ω_R(Ω_ϕ) correspond to spectra out of which the multiples of Ω_z and Ω_ϕ(Ω_z) are filtered. For Ω_R, we see that the leading frequency of the spectrum is twice Ω_z. However, the orbit’s phase-space distribution does not suggest it is a resonant orbit, and this value for Ω_R does not fall within the range abs(Ω_R : Ω_z − 0.7) < 0.15), and it is valid to choose the next-highest peak as fundamental Ω_R.