Normalised water production rate and slopes of differently shaped comets (sphere, 67P, 81P, 103P). A sphere with an obliquity of 0° is shown as areference. Any shape at 0° has a similar production rate curve. Comets 67P, 81P, and 103P are shown at obliquities of 60°. Left and right panels: pre- and post-perihelion, respectively. Pre-perihelion distances are denoted as negative and post-perihelion distances are given as positive. For a 67P-like orbit, perihelion occurs at 1.24 au (or −1.24 au in the pre-perihelion figures on the left).
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