Fast Fourier transform of R(t) for the full ∼100 Gyr orbit integration of the three selected stars: A, B, and C. Grey dash-dot and dotted lines correspond to the frequencies derived by SuperFreq and NAFF, respectively. All three stars show a peak at Ω_R ∼ 4, which would place the star on the single Ω_Z-Ω_R branch, and another peak at a slightly higher frequency, which places the star on the 1:2 resonance.