Synthetic relative intensity variations in the SDO/AIA 171Å bandpass. (a) Intensity variations, averaged along a set of LOS rays as shown in Fig. 14, as a function of time, obtained numerically for an oscillation beginning at 11:19 UT. (b) Relative intensity averaged over the transverse coordinate as a function of time. The dashed line is a smooth slow trend fitted using a Savitzky-Golay filter. (c) Relative intensity as a function of time found after subtracting the slow trend. (d) Relative intensity as a function of time found after subtracting the slow trend from a time series where the relative intensity in panel (a) has been averaged only over the outer half of the loop, i.e. over the transverse interval for x between −248 and −200 Mm in the numerical domain. The dashed line is a damped sinusoidal fit.