The wavelet transform of the 2009 TW Hya MOST data supplemented by the ASAS data, as explained in the text. The amplitude power of the transform is expressed by the grey-scale intensity plus contours with arbitrary units. Edge effects are present outside the white broken lines; they do not affect our conclusions. At the bottom, the combined MOST and ASAS V-band light curve, resampled into a uniformly distributed time grid with 0.2114 d spacing, is shown; at the right is given a comparison of the restored (via horizontal averaging) frequency spectrum (the continuous line) with the power spectrum corresponding to the amplitude spectrum in Fig. 2 (the dotted line).