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Table 5

Derived 12CO 6–5 average optical depths in the center and line wings.

Source τ center τ blue τ red

NGC 2071 >15 2 < 1
L1641 S3 MMS 1 >20 2 2
Vela IRS 17 >15 4.5 2.5
Vela IRS 19 >20 6.5
IRAS 20050+2720 >10.0 <1.0 <1.0
Serpens SMM1 >9.5 2.2 1.6

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