Overview of loops L1 and L2. (a) Full-disk image of FSI₁₇₄, highlighting the location of L1 (indicated by a white arrow) in NOAA AR 12859. The region enclosed by the white square marks the field of view of HRI_EUV. (b) Snapshot of HRI_EUV, with a larger zoomed-in view of L1. The region enclosed by the green square is WOW-processed and shown in (c). (d)–(f) Same as (a)–(c), but for L2.