Comparison between observed (symbols) and synthetic (lines) X-ray lightcurves in the [0.5, 2] keV (upper panels) and [3, 10] keV (lower panels) bands for the best-fit HD model of Orlando et al. (2015; left panels) and for the MHD model MOD-B1 presented here (right panels). Solid lines show the synthetic lightcurves; dotted, dashed, and dot-dashed lines indicate the contributionto emission from the shocked ejecta, the shocked plasma from the H II region, and the shocked plasma from the ring, respectively; the different symbols show the fluxes measured with Rosat (black diamonds; Haberl et al. 2006), ASCA (green; Orlando et al. 2015), Chandra (red; Helder et al. 2013; Frank et al. 2016), and XMM-Newton (cyan; Haberl et al. 2006; Maggi et al. 2012; Orlando et al. 2015).