TESS light curves and frequency spectra of (13383), (38615) and (228155). Top: TESS light curves folded with the rotation periods. Grey points are individual observations. We combined the data into 36 phase bins and show the binned rotation curve with large red points. Middle: Power spectra. For (13383) both the rotation frequency and its double are present. For (38615) and (228155), only the double-frequency (half-period) signal is significant, due to their symmetric rotation curves. Bottom: Light curves from the ZTF survey, folded with the same periods.