Cartoon depicting the two geometries. The gamma-ray emission region is outlined with a grey line that traces the rotated 3σ contour of the map shown in Figure 1. The black hole and accretion disc are shown assuming two options for the inclination angle: almost 90° (left) or close to 0° (right). In the perpendicular case, a pair of (hypothetical) jets launching from the black hole are depicted in magenta. In the aligned jet case, a special environment that would explain the gamma-ray morphology is depicted in blue. The different acceleration sites discussed in the text are marked with circles. The sketch is annotated with scales derived from the best-fit gamma-ray models for the adopted distance of 6.2 kpc.