Panel a: time−distance diagram of S1 in 171 Å showing the transverse oscillation of the coronal loop. The magenta plus symbols denote the central positions of the loop. On the y-axis, s = 0 and s = 12″ denote the south and north endpoints of S1, respectively. Panels b–d: time−distance diagrams of S2 in different wavelengths showing the transverse oscillation of the filament. The magenta plus symbols denote the central positions of the filament. On the y-axis, s = 0 and s = 48″ denote the south and north endpoints of S2, respectively. The red arrow on the x-axis signifies the start time of C3.4 flare in SXR.