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Fig. 4.


Time-distance diagrams of S0 in different wavelengths, showing the transverse oscillations of the EUV loop. The cyan (blue) plus symbols denote the central positions of the loop excited by CRF1 (CRF2). The red dotted lines indicate slow expansion of the loop before CRF2. The red arrows on the x-axis signify the starting times of CRF1 and CRF2 in SXR. On the y-axis, s = 0 and s = 21″ denote the northeast and southwest endpoints of S0, respectively.

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