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Fig. 2

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Spectral energy distribution diagram of SMM3 and SMM4 (upper and lower panels, respectively) along with spectra from Spitzer/IRS and Herschel/PACS. Fluxes for both instruments are extracted within a region encompassing the 3 × 3 central spaxels of PACS. Filled circles are flux densities from IRAC at 3.6, 4.5, 5.8, and 8.0 μm bands (red, Harvey et al. 2007), MIPS at 24 and 70 μm (blue, Harvey et al. 2007), SCUBA at 450 and 850 μm, (green, Davis et al. 1999) and 1100 μm (black, Enoch et al. 2007). Red arrows represent upper limit values for the IRAC bands.

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