Illustration of how the UV/optical blackbody luminosity (L _BB) and the 0.3–10 keV X-ray luminosity (L _X) are measured and what those values represent regarding the full SED of the transient. Colored points indicate observed UV/optical photometry, the best-fitting blackbody function is shown in dark gray, and the area below the curve is the measured L _BB. The black plus signs show the observed X-ray spectra and best-fit X-ray model, and the measured L _X is also shown in gray. Both UV/optical and X-ray components are corrected for Galactic extinction/absorption.