Diffraction pattern created by Dimorphos, with the geometry of the chords (dotted lines). The horizontal and vertical axis are, respectively, the along- and cross- track directions. The white ellipse represents the geometric projection of the shape of Dimorphos. The background shows the diffraction pattern sampled by the four observers, with a large Poisson spot at the centre. Only one chord (F₂) is a geometric occultation; the one at the bottom (G₂) is just grazing.