Fig. 6
Spatial density of all X-ray sources in the Third XMM-Newton serendipitous source catalog for the same region as in the previous figure. The Gaussian kernel used and contour separation are the same. NGC 1980 is detected as a distinct enhancement in the surface density of X-ray sources, together with the Trapezium cluster, the L1641N population, and the hitherto unrecognized group that we name L1641W.
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