MUSE-ALMA Haloes surveys in context of other comparable efforts. This figure reports surveys targeting quasar absorbers with known N(H I) column densities as a function of redshift (this work; Muzahid et al. 2020; Chen et al. 2020; Lofthouse et al. 2023; Erb et al. 2023; Kanekar et al. 2018; Klitsch et al. 2021; Neeleman et al. 2025). IFU refers to both VLT/MUSE and Keck/KCWI. Symbol sizes are proportional to the number of targets in each survey. On top of the sizeable sample, the MUSE-ALMA Haloes survey uniquely combines 3D observations at optical and millimetre wavelengths to enable studies of the multi-phase gas.