= Solution
For a fixed $\beta$, release points from $f=-\pi/2$ through the current $f=\pi/2$ generate a <syndyne>. The newest grain is still at the comet, whereas earlier grains have had longer to separate. The right panel of the figure shows the resulting family. The $\beta=1$ curve consists of particles following the tangent lines inherited at their respective release points. Residual gravity bends the $\beta<1$ syndyne starward and shortens its displacement; net repulsion bends the $\beta>1$ syndyne anti-stellar and lengthens it.
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