Spectral energy distributions for the ULX counterpart in comparison with standard stars of different MK spectral types. The absolute magnitudes of these spectral types are taken from Schmidt‐Kaler (1982). All magnitudes are converted to fluxes to enable comparison between HST and UBVRI systems. The magnitudes/fluxes in filters F330W, F435W, F555W, and F814W were corrected for ﹩E( B-V) =0.11﹩ mag (﹩A=0.561﹩, 0.455, 0.335, 0.196, respectively), ﹩E( B-V) =0.33﹩ mag (﹩A=1.684﹩, 1.366, 1.005, 0.587, respectively), and ﹩E( B-V) =0.44﹩ (﹩A=2.245﹩, 1.821, 1.340, 0.783, respectively) assuming a Galactic extinction law. The overall spectral shape of the counterpart dereddened with ﹩E( B-V) =0.33﹩ mag best matches the shape of an O7 V star.