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Fig. 3


Spatial distribution of all detected X-ray sources (crosses), and of stars from the SSB optical catalogue (dots) within 15 of cluster center. The two tilted blue squares are the two ACIS-I FOVs. The dashed line running almost diagonally throughout the figure is the cluster symmetry axis obtained from our principal-component analysis. The Galactic Plane direction is here approximately towards South-East. The big red arrow at top right indicates galactic North. Color codes for X-ray detected sources (crosses) are: blue for OB stars, cyan for AF (including some B-type) stars, red for low-mass pre-main-sequence stars, purple for field MS stars, magenta for foreground stars, and green for optically unidentified sources.

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