The following plots show the Cassini trajectory in a GSE-like coordinate
system. In this coordinate system, the +Z axis is aligned with Saturn's axis
of rotation and the Sun is in the +X-Z half-plane. There two plots per Rev
(orbit), from apoapsis to apoapsis, one of X versus Y and one of
rho=(X^2+Y^2)^0.5 versus Z.
Note that, due to the Huygens tour redesign, Revs are numbered 0,A,B,C,3,4,...