X‐ray source density profile of the RCW 38 cluster. Left: For each probable cluster member, the distance from the cluster center and the number of cluster sources within 0.25 pc (15^{﹩\arcsec﹩}) are plotted. The line is fitted to the data. Right: Similar plot for the probable nonmembers. The bimodal behavior is due to the results being scaled up from 15^{﹩\arcsec﹩} samples.