Flux maps of the Paα, H₂λ2.12 μm, and [Fe ii]λ1.64 μm emission lines. The [Fe ii] map is overlaid with the 3.6 cm radio-continuum image of Collison et al. (1994) as printed in Kotilainen et al. (1996). The molecular hydrogen shows a more centrally concentrated distribution; this is different from the distribution of ionised hydrogen and the shock tracer [Fe ii] which show emission in the centre, but also in a circumnuclear ring with radius 4″ ≈ 240 pc.