RV based analysis of the simulated planet host with random spectral variability. Upper panel: RVs obtained from the spectra through cross-correlating against a PHOENIX template. The RVs are phase-folded according to the planetary period. The blue bar stands for the mean difference between true and extracted RV. Lower panel: GLS periodogram for the RV data. The dashed vertical line marks the expected planetary frequency, where no prominent peak is presented due to the spectral variability induced noise.