Top: solid line in grey represents the intensity values along the loop, relative to the background, averaged over three successive time frames in 171 Å channel. Plus symbols in blue are the 10 point (≈4.3 Mm) smooth averages of these values. The damping sine curve fitted to these smoothed values is overplotted as a red solid line. Obtained fit parameters are labelled. Bottom: similar curves and values generated from the 193 Å channel.