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Table 3
Isotopic abundances in comets adopted from Jehin et al. (2009), Woods (2009), and Bockelée-Morvan et al. (2015).
| Isotopic ratio | Species | Value | Comet | Reference |
|
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| 12C/13C | C2 | 60±15 | West 1976 VI | Lambert & Danks (1983) |
| 93±10 | 4 comets | Wyckoff et al. (2000) | ||
| 85±20 | C/2002 T7 | Rousselot et al. (2012) | ||
| 80±20 | C/2001 Q4 | Rousselot et al. (2012) | ||
| 94±33 | C/2012 S1 | Shinnaka et al. (2014) | ||
|
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| CN | 65±9 | 1P/Halley | Wyckoff et al. (1989) | |
| 89±17 | 1P/Halley | Jaworski & Tatum (1991) | ||
| 95±12 | 1P/Halley | Kleine et al. (1995) | ||
| 90±15 | C/1995 O1 | Lis et al. (1997) | ||
| 165±40 | C/1995 O1 | Arpigny et al. (2003) | ||
| 90±10 | C/1990 K1 Levy | Wyckoff et al. (2000) | ||
| 85±20 | C/1989 X1 Austin | Wyckoff et al. (2000) | ||
| 93±20 | C/1989 XIX Okazaki-Levy-Rudenko | Wyckoff et al. (2000) | ||
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| 90±10 | 122P/1995 S1 de Vico | Jehin et al. (2004) | ||
| 90±10 | 88P/1981 Q1 Howell | Hutsemékers et al. (2005) | ||
| 95±15 | 9P/ Temple 1 | Jehin et al. (2006) | ||
| 90±20 | 17P/Holmes | Bockelée-Morvan et al. (2008) | ||
| 91±4 | 21 comets | Manfroid et al. (2009) | ||
| 95±15 | 103P/Hartley 2 | Jehin et al. (2011) | ||
| 95±25 | C/2012 F6 | Decock et al. (2014) | ||
|
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| HCN | 111±12 | C/1995 O1 | Jewitt et al. (1997) | |
| 94±8 | C/1995 O1 | Bockelée-Morvan et al. (2008) | ||
| 114±26 | 17P/Holmes | Bockelée-Morvan et al. (2008) | ||
| 109±14 | C/2014 Q2 | Biver et al. (2016) | ||
| 124±64 | C/2012 F6 | Biver et al. (2016) | ||
|
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| C2H4 | 83±12 | 67P | Rubin et al. (2017) | |
|
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| C2H5 | 84±9 | 67P | Rubin et al. (2017) | |
|
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| CO | 86±9 | 67P | Rubin et al. (2017) | |
|
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| CO2 | 84±4 | 67P | This work | |
|
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| 16O/18O | H2O | 518±45 | 1P/Halley | Balsiger et al. (1995) |
| 470±40 | 1P/Halley | Eberhardt et al. (1995) | ||
| 530±50 | 4 comets | Biver et al. (2007) | ||
| 425±55 | C/2002 T7 | Hutsemekers et al. (2008) | ||
| 300±150 | C/2012 F6 | Decock et al. (2014) | ||
| 523±32 | C/2009 P1 | Bockelée-Morvan et al. (2012) | ||
| 556±62 | 67P | Altwegg et al. (2015) | ||
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| CO2 | 494±8 | 67P | This work | |
|
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| 13C16O2/12C18O16O | CO2 | 2.93±0.04 | 67P | This work |
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