Multi-wavelength images with a same FOV seen in Fig. 1 (b). They are observed by SUTRI at 465 Å (a), SDO/AIA at 171 Å (b), 193 Å (c), and 335 Å (d), and have been processed by the MGN technique. The magenta curve outlines the targeted loop. The straight cyan lines indicate the locations of three artificial slits (S1, S2, and S3), which are used to generate time-distance maps, and the green asterisks (‘*’) mark their starting points.