ZTF and phase-averaged TESS light curves of the photometrically variable stars in our sample. In the first and second column the light curves of (possible) UHE WDs are shown, and in the last two columns the light curves of non-UHE WDs. For each star, the light curves are shown one below the other, and the beginning of a set of light curves for a particular star is marked by the title, which contains the name of the variable star.