Radial velocity (RV) analysis of GJ 4274. The top row shows the raw RV data with offsets removed (RMS = 7.06 m/s). The second and third rows display the contributions of planets b and c to the RV signal, respectively, along with their phase-folded RV curves. The RV data in the left panel for planet c are the residuals of the contribution of planet b. The bottom panel presents the residuals after removing all modeled signals (RMS = 5.20 m/s). The rightmost column contains the periodograms, which highlight significant periods in the RV data at each step. The significance level of FAP = 10⁻³ is indicated by the horizontal dashed red line.