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Fig. 15

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The evolution of the expansion velocity with distance to the nucleus in the coma of comet C/2006 P1 (McNaught) on 16.5 January 2007. Measurements of line widths from Table 9 are plotted as in Fig. 13. The upper values (vexp(r) and VHM) correspond to the  ~ dayside larger velocities (v > 0).

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