X-ray lightcurves and spectra of the canonical (Lc) model. Left panel: the X-ray lightcurves in EP WXT band (0.5–4 keV). The blue, red, green, and purple lines correspond to the viewing angles of 10°, 20°, 45°, and 60°. The solid and dashed lines correspond to the X-ray lightcurves produced at redshifts z = 0 and z = 0.7. The black solid lines are sensitivity limits of EP WXT taken from W. Yuan et al. (2022) for sources at redshifts z = 0.1 and z = 0.7. Middle panel: the T₉₀-averaged spectra at different viewing angles. The EP WXT band is shown as the gray shaded region. The black dashed line indicates a power-law spectrum with a photon index of 2.5. Right panel: the evolution of peak energy in the Lc model. The black dashed line indicates a power-law decay rate ﹩{E}_{{\rm{peak}}}\propto {t}_{{\rm{obs}}}^{-0.6}﹩.