Range of abundances of grain-surface complex molecules relative to water ice from our model calculations (red lines) compared with those derived from observations of cometary comae (blue asterisks and lines) and our initial dark cloud ice ratios (green asterisks). The comet data are from Bockelée-Morvan et al. (2004) and Crovisier et al. (2006). The single points and upper limits for the comet ratios represent data derived from observations of comet Hale-Bopp (Crovisier et al. 2004b).
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