SEDs of protostar candidates. Photometry detections are marked as circles, with upper limits marked as inverted triangles. The spectra correspond to Spitzer/IRS observations, when available. See Table 3 for details and references regarding the photometry data. In the relevant cases, a modified black-body is fitted to the data (as a whole for SMM 1 A and SMM 1 As; in the submillimeter range only for the other sources) and the corresponding values of temperature (T) and β are indicated in the figure, see Sect. 4.1 for more details. IRAS 18598 is probably composed of two sources.
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