Upper panel: [H − K_s, J − H] diagram of the 2MASS and Spitzer candidate YSOs. 2MASS candidate YSOs are indicated by blue squares. 2MASS colors of Spitzer candidates are indicated by asterisks and filled green squares. They are located in the giant and main sequence regions of the diagram. The dashed lines show the reddening vectors corresponding to M0 III and B2 V stars. The crosses are placed at intervals of five magnitudes of visual extinction. Bottom panel: location of candidate YSOs from the Spitzer database. Crosses represent the 29 sources which lie in Class I and II regions. Triangles, asterisks, and filled squares correspond to sources projected onto the filament, the southern clump and clumps 1 and 2, respectively. Open and filled triangles represent candidate YSOs that do not have a 2MASS counterpart and those that have been detected in one or two filters only, respectively. Spitzer sources with 2MASS colors are indicated by asterisks and filled rectangles. They occupy the main sequence and giant regions in the upper panel. 2MASS sources with Spitzer colors are indicated by optn squares. They lie in the Class III region where main sequence, giants, and pre-main sequence stars overlap.