Model SEDs of YSOs for Stages I, II, and III (from left to right columns), stellar masses of 0.2, 2.0, and (from top to bottom rows), and for disk inclinations of 18.2° (blue, pole-on), 49.5° (green), 81.4° (red), and 87.1° (edge-on, black). Wavelength ranges of the four IRAC filters are marked with different tones of shades. We consider these 36 models in our analyses among 200 000 models provided by Robitaille et al. (2006).