Table 12: Compared relative production rates.
Molecule C/1999 T1 (McN.-H.) C/2001 A2 (LINEAR) C/2000 WM1 (LINEAR) 153P/I.-Z.
$\langle r_{\rm h}\rangle^1$ 1.3 1.1 1.2 1.0
Abundance relative to water
HCN $0.08\pm0.01$% $0.14\pm0.01$% $0.08\pm0.01$% $0.11\pm0.01$%
CH3OH $2.4\pm0.3$% $2.8\pm0.4$% $1.3\pm0.2$% $2.5\pm0.1\times r_{\rm h}^{+0.8}$%
CO $15 \pm 5$% <3.7% <1.4% $3.8\pm0.6$%
H2CO $0.32\pm0.07$% $0.24\pm0.05$% $0.37\pm0.05$% $0.39\pm0.04$%
H2CO(p) $0.16\pm0.04$% $0.05\pm0.01$% 0.09-0.18% $0.10\pm0.01$%
H2S $0.55\pm0.08$% $1.15\pm0.05$% $0.13\pm0.02$% $0.82\pm0.08$%
CS $0.08\pm0.02$% $0.07\pm0.01\times r_{\rm h}^{-5}$% $0.05\pm0.01$% $0.067\pm0.016\times r_{\rm h}^{-1.0}$%
HNC <0.007% $0.0066\pm0.0010\times r_{\rm h}^{-2.9}$% <0.003% $0.0053\pm0.0003\times r_{\rm h}^{-2.6}$%
CH3CN <0.052% $0.028\pm0.010$% $0.014\pm0.004$% $0.016\pm0.004$%
Abundance relative to HCN
CH3OH $31\pm5$ $20\pm2$ $16\pm2$ $22\pm6$
CO $200\pm80$ <23 <17 $36\pm8$
H2CO $4.0\pm1.0$ $1.6\pm0.3$ $4.2\pm0.5$ $3.6\pm0.3$
H2S $6.3\pm1.1$ $6.9\pm0.7$ $1.6\pm0.3$ $7.5\pm0.5$
CS $1.1\pm0.2$ $0.2\pm0.1$ $0.6\pm0.1$ $0.55\times r_{\rm h}^{-0.7}$
HNC <0.082 $0.052\times r_{\rm h}^{-3.7}$ <0.0363 $0.055\times r_{\rm h}^{-2.2}$
CH3CN <0.6 $0.19\pm0.07$ $0.18\pm0.04$ $0.14\pm0.04$
HC3N   <0.05   <0.09
OCS <125 <1.1   <2.0
HNCO   <0.23   $0.39\pm0.08$
SO   $0.8\pm0.2$   <0.5
HCOOH   <1.3   <0.8
1 Mean heliocentric distance (in AU) for the abundances, unless otherwise specified.
2 at $r_{\rm h}=1.42$ AU.
3 at $r_{\rm h}=1.18$ AU.
(p): parent distribution.

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