Time-distance maps show the transverse oscillation of the coronal loop at slit S1 in passbands of AIA 171 Å (a), 193 Å (b), and 211 Å (c). The pluses (‘+’) outline bright centers of the oscillating loop. The magenta curve and the cyan error bars represent the best-fitting result and their fitting uncertainties, whereas the green line indicates the background trend. The Arabic numerals mark five cycles of the loop oscillation. The cyan arrow indicates the slit direction.