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Table 4
Previous measurements of the 12C/13C ratio based on the (1,0) 
bandhead.
| Comet | 12C/13C ratio | Author | ||||
|
|
||||||
| Ikeya 1963 I | 70 ± 15 | Stawikowski & Greenstein (1964) | ||||
| Tago-Sato-Kosaka 1969 IX | 100 ± 20 | Owen (1973) | ||||
| Kohoutek 1973 XII | 115 |
Danks et al. (1974) | ||||
135 |
Danks et al. (1974) | |||||
| Kobayashi-Berger-Milon 1975 IX | 100 |
Lambert & Danks (1983) | ||||
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