Table 4: Additional important reactions for a perturbation amplitude of 1.0, for model 2 and Composition A.
Number Reaction^a $\alpha$ $\beta$ $\gamma$

168 C + SO₂ $\rightarrow$ CO + SO

173 CH₂ + O $\rightarrow$ CO + H + H 1.20e-10 0.00 0.00

308 He⁺ + H₂O $\rightarrow$ OH + He + H⁺ 1.32e-09 -0.50 0.00

309 He⁺ + H₂O $\rightarrow$ OH⁺ + He + H 1.32e-09 -0.50 0.00

333 He⁺ + OCS $\rightarrow$ CS + O⁺ + He 8.40e-10 -0.50 0.00

360 C⁺ + H₂O $\rightarrow$ HOC⁺ + H 1.80e-09 -0.50 0.00

444 CH₃⁺ + S $\rightarrow$ HCS⁺ + H₂

447 CH₃⁺ + SO $\rightarrow$ HOCS⁺ + H₂ 4.20e-09 -0.50 0.00

459 CH₄ + S⁺ $\rightarrow$ H₃CS⁺ + H 1.40e-10 0.00 0.00

509 O + HCS⁺ $\rightarrow$ S + HCO⁺ 5.00e-10 0.00 0.00

510 O + HCS⁺ $\rightarrow$ OCS⁺ + H 5.00e-10 0.00 0.00

552 H₃O⁺ + H₂CO $\rightarrow$ H₃CO⁺ + H₂O 2.60e-09 -0.50 0.00

553 H₃O⁺ + CH₄O $\rightarrow$ CH₅O⁺ + H₂O

646 He⁺ + H₂O $\rightarrow$ H₂O⁺ + He 1.32e-09 -0.50 0.00

663 C⁺ + S $\rightarrow$ S⁺ + C

**Table 4:** Additional important reactions for a perturbation amplitude of 1.0, for model 2 and Composition A.
Number	Reaction^a	$\alpha$	$\beta$	$\gamma$
168	C + SO₂ $\rightarrow$ CO + SO
173	CH₂ + O $\rightarrow$ CO + H + H	1.20e-10	0.00	0.00
308	He⁺ + H₂O $\rightarrow$ OH + He + H⁺	1.32e-09	-0.50	0.00
309	He⁺ + H₂O $\rightarrow$ OH⁺ + He + H	1.32e-09	-0.50	0.00
333	He⁺ + OCS $\rightarrow$ CS + O⁺ + He	8.40e-10	-0.50	0.00
360	C⁺ + H₂O $\rightarrow$ HOC⁺ + H	1.80e-09	-0.50	0.00
444	CH₃⁺ + S $\rightarrow$ HCS⁺ + H₂
447	CH₃⁺ + SO $\rightarrow$ HOCS⁺ + H₂	4.20e-09	-0.50	0.00
459	CH₄ + S⁺ $\rightarrow$ H₃CS⁺ + H	1.40e-10	0.00	0.00
509	O + HCS⁺ $\rightarrow$ S + HCO⁺	5.00e-10	0.00	0.00
510	O + HCS⁺ $\rightarrow$ OCS⁺ + H	5.00e-10	0.00	0.00
552	H₃O⁺ + H₂CO $\rightarrow$ H₃CO⁺ + H₂O	2.60e-09	-0.50	0.00
553	H₃O⁺ + CH₄O $\rightarrow$ CH₅O⁺ + H₂O
646	He⁺ + H₂O $\rightarrow$ H₂O⁺ + He	1.32e-09	-0.50	0.00
663	C⁺ + S $\rightarrow$ S⁺ + C

^a Only rate coefficients that differ by more than 10 percent from the UMIST value are included.

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