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Fig. 3


Observed column densities of C3 (filled symbols) and C2 (open symbols) versus projected nucleocentric distance for comet Hale-Bopp on Dec. 19/20, 1997, according to H05. Solid black lines show the best fits obtained in his work, using the reaction network of H05. The dashed line shows the C2 and C3 column density profiles for a C2H6 production rate that has been raised by a factor of 10 relative to the best-fit result, the dashed-dotted line for an increase by a factor of 100 (for a change by a factor of 10 no difference can be seen for C3). The red lines are the corresponding column density profiles obtained for the production rates of H05.

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