Displacement of the loop apex (z = 100 Mm) and respective wavelet spectra, for a loop with B_z ∼ 30 G (top panels) and B_z ∼ 20 G (bottom panels). The signals on the left are the detrended displacement from the driven oscillations. The signals on the right correspond to the fundamental standing kink mode, excited by an initial velocity field. The white contours show the 99% significance level.