2D schematic representation of the four most extreme probe trajectories as viewed from Earth. The launch/reception window captures the seasonal variation in Earth's position, and the probe encounter window captures the proper motion of the target star. As shown, all encounters are assumed to fall on the same side of the target star, which moves away from the encounter positions. Downlink operation follows encounter. Receiver coverage is assumed to cover all concurrently transmitting probes, and a coronagraph function takes advantage of spatial separation to reject a portion of the target star's radiation.