For a series of emission velocity, maps of the emission direction (in cometocentric longitudes and latitudes) of the large particles matching the features observed on May 12, using the same colour code as in Fig. 6. For any velocity, a particle matching a feature always has a “mirror particle”: one is emitted toward the Earth, the other one away from the Earth. On the 2.375, 2.5, and 2.625 m s⁻¹ panels, the position of a 40° half-opening cone matching best the feature is represented. The direction directly toward Earth is marked by a black cross, away from Earth by a red cross, at 0° latitude, and 90° and 270° longitude, respectively. Re-projecting these maps onto concentric spheres, with the geometry of May 12, would lead to Fig. 6.