Detected point-like sources in the Chandra 0.7–5 keV raw image of W49B. The color-bar shows the scale of the counts per pixel (0.′′5). The details of the sources in the ellipses are summarized in Table A.1. The red regions denote the sources with best-fit blackbody luminosity in the range 7.0 × 1032– corresponding to the luminosity range of NSs at the age of 5–6 kyr predicted with the minimal cooling paradigm (see Appendix A and Fig. 8 for details).