Spectral energy distribution evolution as a function of time and inclination for the MU2 model. The black line represents the SED when the FHSC has not yet been formed, whereas the red lines indicate SEDs after FHSC formation. The gray area around the initial SED reflects the uncertainties in the initial temperature of the prestellar core (9 K < T0 < 13 K). The blue cross represents the sensitivity at 24 μm (0.83 mJy at 3σ/24 s) for the Spitzer c2d Legacy program (Evans et al. 2003) and the horizontal blue line the sensitivity of the Herschel PACS instrument (~4.4 mJy in point source mode, 5σ/1 h; Poglitsch et al. 2010).
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