Energy density (﹩{\rm{\Gamma }}({\rm{\Gamma }}-1){\rho }^{{\prime} }{c}^{2}+{{\rm{\Gamma }}}^{2}{e}^{{\prime} }﹩) maps of the canonical model (Lc). Six panels correspond to different lab-frame times. The colorbar shows the logarithmic energy density in units of erg cm⁻³. The black solid lines and green dashed lines in the bottom three panels indicate the photospheric radius r_ph and diffusion radius r_diff.