Simulated projected X-ray radial flux profiles for different models assuming spherical symmetry compared to the experimental measurements (green squares Kishishita et al. 2013). Normalized surface brightness in the energy range 2−10 keV is plotted as a function of the angular distance from the forward shock of the SNR with negative values corresponding to the interior of the remnant. The radial profile obtained within the asymmetric model discussed in Sect. 4.2 is represented by the black filled circles connected with the dashed line.