X-ray lightcurves (solid lines) in the [0.5, 2] keV (upper panels) and [3, 10] keV (lower panels) bands synthesized from models N16.3 (left panels), B18.3 (center panels), and S19.8 (right panels) compared to the lightcurves of SN 1987A observed with Rosat (black triangles; Haberl et al. 2006), ASCA (green diamonds; Orlando et al. 2015), Chandra (magenta circles; Helder et al. 2013; Frank et al. 2016) and XMM-Newton (cyan circles; Haberl et al. 2006; Maggi et al. 2012). Dotted, dashed, and dot-dashed lines indicate the contribution to emission from the shocked ejecta, the shocked plasma from the H II region, and the shocked plasma from the ring, respectively.