Comparison of the component masses of the DWDs in the SEBA population with an r-band magnitude limit of 20.5 to the observed ZTF population. Each rectangular cell represents a mass bin and is shaded according to the number of systems SEBA predicts for that bin (corrected for the magnitude limit, the probability of eclipsing, and the ZTF sky coverage). Each red dot is an observed system. Here, we take M₁ to always be the more massive of the WDs in the binary.