Left panel: the J-band spectrum of XID54204 around [O iii] λ5007 line extracted from a region of 1′′× 1′′ centred at the QSO position. The colour-coding for different part of the spectra are defined in the same way as Fig. 2, top panel. Right panel: continuum collapsed channel map around the narrow component of [O iii] λ5007 line (yellow region in the left panel, 1.180−1.182 μm). Each pixel corresponds to a spatial scale of 0.25′′ which at the redshift of this object is equivalent to ~2.16 kpc. The white contours indicate the peak of the [O iii] λ5007 emission at levels 50%, 75% and 95%. North is up and east is towards left. The grey circle on the lower left shows the size of PSF.