Hα/[NII] image of the zoomed-in white square in Fig. 1. Again, I-band contour levels are overlaid. Spectra were extracted at the three locations corresponding to the peaks of maximum intensity in the I-band map (N, S1, S2, indicated by circles or ellipses). Also indicated are the positions of the two MERLIN and VLBA radio sources N-G04 and S-G04 (Gallimore & Beswick 2004). The flux is given in units of 10⁻²⁰ erg cm⁻² s⁻¹ pix⁻¹.