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Table 2

Main physical parameters of IR2, IR3, and IR4 derived from the best fitting models for the SED of each source.

Source M    Age env L #models
[M] [× 105 yr] [× 10-5   M yr-1] [× 104   L]

Best Range Best Range Best Range Best Range
IR2 19 18–21 7 1–10 0 0–0.1 4 2–5 0.1 42
IR3 17 1 9.3 3 5.2 1
IR4 13 10–16 2 0.5–4 5.6 1–8 1 1–2 0.4 11

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