Top: [C ii] (left) and [O i] (right) spectra of each spaxel. The integrated fluxes were measured within inner dotted lines, with the errors within the outer lines excluding the inner region. Middle: [C ii] (left) and [O i] (right) spatial distribution of integrated flux in each spaxel. Bottom: distribution of derived density and radiation field strength. In order to improve the readability of the plots we adopted the following convention. The line-filled boxes correspond to upper limits on the corresponding property if the flux measurement has <3σ significance, but if the measured value is below the lowest value on the colour bar, then the box is white. If the property cannot be measured (n and G₀ for spaxels with no detections at [C ii] and [O i]), then the box is also white with no values indicated. The [C ii] emission exhibits a normal radial profile, whereas [O i] emission is concentrated close to the WR region.