Overview of emission and absorption components at different positions around MRC0943-242. Middle Panel: composite red-green-blue image of Lyα and HeII emission (see caption of Fig. 1 for more details) with the ALMA 235 GHz contours overlaid in grey. Panel A): the Lyα line profile of the full area of Yggdrasil (elliptical aperture of 1.3″ × 0.7″), showing all four absorption components. Component 2 is the most prominent and goes to zero intensity at its centre. The spectrum has an rms of 0.3 × 10^-17 erg s^-1 cm^-2Å^-1. The blue, green, red, and orange bars above the spectrum shows the range in wavelength the channelmaps in Fig. 6 have been summed over. The blue correspond to panel A), green to panel B), red to panel C), and orange to panel C) in Fig. 6. Panels B) and C): the Lyα profiles of two areas near the nucleus (circular 0.5″ apertures) and have rms of 0.1 × 10^-17 erg s^-1 cm^-2Å^-1. These profiles likewise show signs of all four absorption components. Panel D): the Lyα profile of Bifrost (circular 1.2″ aperture and rms of 0.1 × 10^-17 erg s^-1) showing sign of absorption component 2. Panel E): spectrum extracted at the HeII emitting tail (0.7″ aperture), showing no sign of Lyα emission and an rms of 0.02 × 10^-17 erg s^-1 cm^-2Å^-1. The HeII lines is over-plotted in grey. Panel F): the Lyα profile of the western extended Lyα emitting gas (0.4″ aperture). All Lyα velocity profiles have been fitted with Voigt profiles superimposed on a Gaussian profile. These fits are shown as the red curves over plotted on the spectra.