Spatial distribution of NIR counterparts compared with the visual extinction map⁹. The lowest contours indicate a separation of dense regions (A_V> 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.