Top: Average spectrum of GLEAM-X J0704–37 (black) well fit by a WD + MD binary model (red; parameters in Table 2). The overall flux level was calibrated by matching synthetic photometry (squares), generated from the spectrum, with Gaia average photometry (circles). Middle: Each binary component provides a good fit to the data when the other is subtracted. Bottom: Residuals show no obvious systematic disagreement, aside from the Hα emission and telluric features (gray bands).