Table 3: Differences between best fit model for IRAS 16293-2422 and AFGL 2591.
Parameter IRAS 16293 AFGL 2591
Initial abundance ( $T>100~{\rm K}$)    
CO 1.0(-4) 3.7(-4)
H2S 1.0(-8) 1.6(-6)
H2CO 8.0(-8) 1.2(-7)
CH3OH 1.5(-7) 1.0(-6)
Initial abundance ( $T<100~{\rm K}$)    
CO ( $20 < T({\rm K}) < 100$) 1.0(-4) 3.7(-4)
O 1.0(-4) 8.0(-5)
H2CO ( $60 < T({\rm K}) < 100$) 8.0(-8) 0.0
CH3OH ( $60 < T({\rm K}) < 100$) 1.5(-7) 0.0
$T_{{\rm des}}({\rm K})$ [ $x(T<T_{{\rm des}}) \sim 0$] CO 20 100
H2CO 60 100
CH3OH 60 100
CR ionziation rate $[\zeta]$ (s-1) 5.0(-16) 5.6(-17)
$^{{\rm }}$ a(b) means $a \times 10^{b}$.
$^{{\rm }}$ All abundances are gas-phase, and relative to H2.

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