Orbital alignment of the two exocomet populations. The left-most panel shows the difference between the argument of periastron of the test particle, ω, and the argument of periastron of β Pic c, ω_c. The two panels to the right show the orbits of star-grazing test particles originating from the inner and outer exocomet reservoirs, respectively. The dashed line indicates the direction of the line of sight, while the plane of the sky is parallel to the horizontal axis. Note: in this projection of the coordinate system, particles generally orbit in a counter clock-wise direction.