Extended Data Fig. 1: Photometric fit.
From: A highly magnetized and rapidly rotating white dwarf as small as the Moon

The blue solid line shows the best-fitting model spectrum, fitted to Pan-STARRS and Swift photometry to determine Teff, R⁎ and E(B − V). The synthetic photometric values (obtained from the black line) are shown in red. The Swift values are shown in green with 1σ error bars and the Pan-STARRS values in blue with the error that we chose to account for the photometric variability (0.02 mag).