Properties of primary targets observed with ALMA. Left panel: Redshift distribution of 32 quasar absorbers making up the primary sample of MUSE-ALMA Haloes survey. The filled histogram (green) displays the redshift distribution of the 25 intervening absorbers targeted by ALMA observations. Middle panel: Atomic hydrogen gas column-density distribution of these strong absorbers. The selection criterion imposes the cut at log [N(H I)/cm⁻²] > 18. Right panel: Neutral gas absorption metallicity measured from archival and new VLT and Keck observations after ionisation and dust correction by Halley et al. (2026). The metallicity is the abundance of all metals and is expressed as [M/H]=log{N(M)/N(H)} − log{N(M)/N(H)}_⊙.