[FIGURE]

*Fig. 1 <sc2.htm#figure1>.* The [15] - [7]-[15] diagram. The
short-dashed line gives the proposed separation between YSOs (to the
right) and evolved stars (to the left). The location of different types
of objects is indicated. The long-dashed line gives the position in the
diagram of a 10 [FORMULA] black-body placed at the distance of 1 kpc (or
10^3 [FORMULA] at 10 kpc) with temperatures 300, 400, 500, 600, 700,
800, 900, 1000, 2000, 4000 K marked by circles. The arrow in the lower
right indicates the displacement for A_/v/ = 20. The dot-dashed line
defines the region of confidence imposed by the conditions [7] [FORMULA]
9.5 and [15] [FORMULA] 8 magnitudes.