Left: Normalized quartile values for stars within 200^{﹩\arcsec﹩} of the cluster center. A grid of temperature and absorption is overlaid following Hong et al. (2004). The solid lines are lines of constant ﹩N_{\mathrm{H}\,}﹩, 0.1, 0.5, 1.0, 5.0, and ﹩10\times 10^{22}﹩ (bottom to top). The dashed lines are lines of constant temperature ﹩kT=0.1﹩, 0.5, 1.0, 5.0, 10, and 30 keV (bottom to top). Errors are plotted. The parallelogram outlines the region occupied by probable cluster members. The diagonal lines are offset ±3 deviations from a fit to all the bright sources to the right of the vertical demarcation. See text for details. Right: Same as left, but for sources more than 200^{﹩\arcsec﹩} from the cluster center. For clarity, only stars with more than 30 counts are plotted.