**Table 10:** Models with SO₂ abundance "jumps''.
Source	(SO₂/H₂) $_{\rm out}$	(SO₂/H₂) $_{\rm in}$
	10^-9	10^-7
W3 IRS5	10	10
MonR2 IRS3	1	12^b
AFGL 2136	0.5	0.8^b
W33A	1	1
AFGL 2591	2	2
NGC 7538 IRS1	1	14^b
IRAS 16293^a	0.5	1

$\textstyle \parbox{6cm}{ $^a$\space From \citet{fred02}.\\ $^b$\space Estimated value.}$

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