Similar to Fig. 6, but with the time-distance diagram in 171 Å along slit S4 shown. The oscillation best-fit parameters are shown in the figure with the white dashed line. Bright structures are seen between 01:10 and 02:10 UT, which is the impulsive phase when the oscillation is triggered. After 2:10 UT, the absorbing plasma in the filament moves periodically around y = 120 arcsecs. Between 6:30 and 7:20 UT, there is a gap with no SDO data.