Synthetic X-ray emission maps from models N16.3 (top), B18.3 (middle), and S19.8 (bottom) at the labeled times. Each panel consists of 4 quadrants: emission maps in the [0.5, 2] keV (upper left) and [3, 10] keV (upper right) bands, and corresponding three-color composite representations (lower left and right). Each image is normalized to its maximum for visibility; the X-ray maps were convolved with a Gaussian of size 0.15 arcsec to approximate the spatial resolution of Chandra; the three-color composite images were smoothed with a Gaussian of 0.025 arcsec; the colors in the composite show the emission from shocked ejecta (green), shocked plasma from the ring (red), and from the H II region (blue). See online Movies 2, 3, and 4 for animations of these data.