[O II] and Fe II* spatial properties. First column: [O II] NB image (top, Sect. 5.1). Legend is the same as in Fig. 3a. The 1σ level corresponds to a SB of 2.5 × 10⁻¹⁹ erg s⁻¹ cm⁻² arcsec⁻². Bottom panels: total and directional (below and above the [A,B,C] axis) azimuthally averaged radial SB profiles centered on galaxy A (from top to bottom, respectively, see also insets for illustration) of the [O II], [O II] continuum and rescaled [O II] continuum (orange, black and gray, respectively) emission. The radial positions of other group members with respect to galaxy A are indicated by the vertical dashed lines. Second column: same as first column but for Fe II* (purple). Third column: comparison of the Mg II, [O II] and Fe II* 2σ significance level contours (blue, orange, and purple, respectively) superimposed on the Mg II NB image (top). Bottom panels: show a comparison of the radial SB profiles where the Fe II* profile (shaded purple) has been rescaled to the [O II] profile at the SB peak and Mg II (shaded blue) at the position of galaxy C (Appendix D). For this plot the [O II] map was degraded to the resolution of the Mg II emission (Sect. 5.1).