Top: TD maps at 171 Å for event 28 loop 1 (left) and event 36 loop 2 (right). The dashed blue line is the oscillation time-series obtained from Gaussian tracking of the loop position. Middle: corresponding detrended TD maps. The horizontal lines denote the averaging region, ±2 pixels about the centre pixel. Bottom: same as above, but after smoothing in time with a three-minute boxcar, and subtracting the minimum intensity at each time.