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Table D.1

Parameters used for the envelope models.

Source penv rin [AU] rout [AU] nin (cm-3)

IRAS 2A 1.7 35.9 17950 4.9 × 108
IRAS 4A 1.8 33.5 33500 3.1 × 109
IRAS 4B 1.4 15.0 12000 2.0 × 109
VLA 1623 1.4 4.3 10320 1.6 × 109

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