The evolution of the expansion velocity with distance to the nucleus in the coma of comet C/2002 X5 (Kudo-Fujikawa) on 26.5 January 2003. The measured lines widths have been plotted with their errorbars at a distance corresponding to the molecular lifetime. Arrows represent the effect on scalelength of the β0 = 1–3 × 10-5 s-1 (Table 9) domain for CS. For HCN, HNC, and CH3OH, the arrow points to the increase in scalelength due to the screening.
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