Best-fitting results with different reflection models (M1 and M2 from left to right at the top; M3 and M4 at the bottom) for NICER/NuSTAR observations of 4U 1636–53. We show the fitted spectra and the individual model components (main panel), and the residuals in terms of sigmas (subpanel) in the plots. The components diskbb, blackbody, (thcomp × diskbb) or (thcomp × bb), and relxillCp or relxilllpCp are plotted with the dotted purple line, the dot-dashed deep blue line, the dashed orange line, and the solid light blue line, respectively.