Fig. 10
Orbital speed |v| and the transverse speed relative to solar wind plasma 
along the orbits of the comet Ikeya–Seki (upper panel) and of Aquarids (lower panel).
χ
is the true anomaly angle. Near the aphelium of each orbit 
, meaning that the value of 
there is determined by the transverse speed of the solar wind rather than by the orbital velocity.
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