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Fig. 3


Spitzer/IRAC CCD and CMDs. The first panel (top, left) displays the areas where Class I, II and III objects are located (assuming a stellar or substellar nature). The optical/IR counterparts of the B30 APEX/LABOCA sources are represented as magenta circles (solid for probable and possible members, empty circles for unknown status and a black cross for probable and possible non-members). For comparison, we have added known members of the ~5–8 Myr cluster C69 as plus, blue symbols, which is located in the same star forming region complex (Dolan & Mathieu 1999; Barrado y Navascués et al. 2004, 2007; Morales-Calderón 2008; Barrado et al. 2011; Bayo et al. 2011). We have also added confirmed members of Serpens from Harvey et al. (2007), about ~2 Myr, as green-black asterisks. Most of our B30 counterparts can be classified as Class I or as transitional objects between Class I andClass II. Other panels include extragalactic sources as light gray symbols and have been extracted from Sacchi et al. (2009): up- and down-ward open triangles correspond to the AGN1 and AGN2, whereas three-point stars represent emission line galaxies and open circles other galaxies. We also have include BT-settl isochrones (Allard et al. 2012)with 3 and 20 Myr.

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