Top panel: the GLS periodogram ﹩{\hat{S}}^{\mathrm{LS}}({f}_{k})﹩ (green) of HD 192310 RVs with the best-fit AR(1) (purple solid line), power law (red dashed line), and white noise (black dashed–dotted line) models. Bottom panel: the red noise 5% (red), 1% (orange), and 0.1% (blue) FALs and the 1% white noise FAL (black dashed line) are shown. The peak associated with HD 192310 b (purple dotted lines) is 99.9% significant, while peak with period of HD 192310 c (purple dotted lines) reaches the 99% significance level. The differential rotation of the star is 95% against the red noise FALs with a period of 39.5 days (navy dotted line).