Signals and residuals for n-planet model. In the left panels, the original data, noise-subtracted data, and signals are shown by black points, gray points, and red curve, respectively. The residuals after subtracting signals and the noise model predictions are shown in the middle panels with the same RV range as in the left panels. The distributions of residuals are shown in the right panels. The mean (μ), standard deviation (σ), skewness (μ³), and kurtosis (μ⁴) are shown for each distribution.