Corner plot for the SED fitting presented in Section 3.2 for ZTF J2008+4449. As both the distance and the radius of the white dwarf act as a normalization factor on the atmosphere models, we fit for the ratio R_*/D, where R_* is the radius of the star in km and D is the distance to the star in parsecs. We then convert the value obtained to a radius for the white dwarf by employing the parallax measured by Gaia DR3 and factoring in the error on the parallax. The other two parameters, effective temperature and reddening, are fit directly. We employed an uniform prior on all parameters.