Fig. 4
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Transmission spectra of WASP-189b around Ca II H&K (top panel) and Hβ (bottom panel) lines. In the top panel, the transmission spectrum shown in black is binned by 0.1 Å, while the transmission spectrum presented in the bottom panel is binned by 0.05 Å. The red dashed lines show the predicted RM effect in the transmission spectrum. The red solid lines show the best-fit Gaussian profile to the transmission spectrum after correcting the RM effect.
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