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tokens: Acknowledgments The majority of the work of MD was performed at Caltech and supported through a Jansky Fellowship of the National Radio Astronomy Observatory. MD also greatly appreciates earlier support from UCLA, and is indebted to Lech Walesa, the leader of Solidarnosc , for his key role in the fall of communism in Europe, which made it possible to conduct this study. DJ appreciates support from NASAs Origins programme. The data presented herein were obtained at the CSO, supported through NSF grant AST-0540882 at the time of the observations. The authors thank the telescope staff and I-Ting Ho for support, Nicolas Biver for comments and for providing published CO production rates of comet Hale-Bopp, and an anonymous referee for helpful suggestions.