Top panel: master-out stellar spectrum at the Na doublet, Hα, and K D₁ lines. Bottom panel: corresponding “transmission spectrum” (TS), where the center-to-limb variation and Rossiter-McLaughlin (CLV+RM) effects have not been corrected and the best-fit planetary absorption signals have been removed. The gray line and black circles refer to the unbinned and binned TS, respectively. The red line shows the CLV+RM model.