Spatial distribution of NIR counterparts compared with the visual extinction map9. The lowest contours indicate a separation of dense regions (AV> 2). The diamonds and crosses represent XMM-Newton and ROSAT sources, respectively. Top panels a–c show objects with less than 5 Myr, 5 to 10 Myr, and more than 10 Myr, respectively. Bottom panels d–f are objects with masses larger than 2 M⊙, 1 to 2 M⊙ and between 0.5 to 1 M⊙, in this panel are highlighted XMM-Newton objects with masses between 2 and 3 M⊙ (diamonds), 3 and 5 M⊙ (X), and more than 5 M⊙ (full diamonds). Black full lines delimit the fields E, C, S, and W and the ROSAT field is indicated by a dashed line.
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