Observed MIR spectrum at 350 days (red, solid line), compared to model spectra of the 15 M_⊙ model (black, solid). To simulate the instrument response, the model has been convolved with a Gaussian of FWHM = λ/R, where the resolving power R was taken to be 60. Also shown are the dust component (pink, dashed), the observed photometry at 3.6 and 4.5 μm (red stars), and the corresponding model photometry for the model (black circles). The observed photometry is at 361 days, and has been rescaled with the ⁵⁶Co decay factor to 350 days (exp−11/111.5).