Morphology of the PJ308–21 system at z = 6.2342. Left: The [O III]_5007 Å line emission map in the quasar+companion galaxies’ system PJ308–21, shown in gray scale (after PSF subtraction). The footprints of the NIRSpec IFU pointings are displayed in gray. We also mark the regions of the main components of the system with colored shading. Right: The same [O III]_5007 Å map (in blue), but now with the [C II]_158 μm map from Decarli et al. (2019) superimposed. The main regions are identified with ellipses: From left to right, we provide the eastern companion (red), the outflow (orange), the quasar host galaxy (green), the bridge (cyan), and the western companion (blue). The [O III] emission arises from the regions where [C II] is brightest, except for the “outflow” component where the [O III] emission stretches beyond the [C II] emission.