SED of A0620−00, corrected for reddening assuming E(B − V) = 0.35. Red squares with error bars correspond to the data from this paper. Blue crosses, black triangles, and purple diamonds show data from McClintock & Remillard (2000), Froning et al. (2011), and Dinçer et al. (2018), respectively. Solid blue, dotted blue, and dashed orange lines show the spectra of the K5V star (Pickles 1998), the blackbody of T_* = 4500 K, and an additional blackbody of T_bb = 10 000 K, respectively.