a) Compact sources (circles) overlaid on high-resolution () column density map. Contours represent 870 μm continuum emission, showing levels of [0.55, 0.65, 0.75, 0.9, 1.1, 1.3, 1.5] Jy beam^-1 (σ = 0.05−0.06 Jy beam^-1). b) Compact sources overlaid on a three-color image. The Hα, 3.6 μm, and 8.0 μm emission are coded in blue, green, and red, respectively. The compact sources are symbolized in plus circles for class 0, in squares for IM, and in circles for class I objects. Crosses denote the class I YSOs identified by ZA06.