SZ effect of a galaxy cluster at various frequencies and the corresponding SZ spectra. Panel a: examples of the SZ effect of a galaxy cluster at various frequencies: 90 GHz, 150 GHz, 230 GHz, 260 GHz, 345 GHz, 460 GHz, and 650 GHz. The circles represent four different aperture sizes for photometry. The solid red circle corresponds to 0.25R₅₀₀, the dotted cyan circle to 0.5R₅₀₀, the dashed pink circle to R₅₀₀, and the dash-dotted white circle to R₂₀₀. Panel b: SZ spectra of the galaxy cluster in panel a measured at the cluster center using different aperture sizes of 0.25R₅₀₀, 0.5R₅₀₀, R₅₀₀, and R₂₀₀, corresponding to the circles in the SZ maps in panel a. The black dots represent the measured fluxes of the SZ effect at different frequencies. We fit the black dots with an analytic formula for the SZ effect (Nozawa et al. 2006). The dashed black lines show the results of fitting the total SZ signal, and the dashed red and blue lines represent the contributions from the tSZ and kSZ effects, respectively. The dotted green line corresponds to the best-fit result of the tSZ-only model. The residuals of the best-fit SZ model and the tSZ-only model with respect to the data are shown as black dots and green crosses in the bottom panels.