Gas fractions divided by their average values on the MS μ_gas/μ_gas(MS) as a function of their relative distance to the MS δMS = SFR/SFR_MS (left panel) and stellar mass M_* (right panel). We use the predicted μ_gas(MS) according to Tacconi et al. (2018) and the parametrisation of SFR_MS following Speagle et al. (2014). We show the observed DP galaxies (red), the SP-EGNOG sample (blue), the COLD GASS sample (grey), the low-SF sample (black), the ULIRG sample (green), and the M sample (turquoise). For the MEGAFLOW sample, we show the detection limits of each galaxy (magenta) and, with an empty square (resp. star), the estimate reached by stacking for galaxies identified with an outflow (resp. inflow; Freundlich et al. 2021). The solid black lines represent the scaling relations found by Tacconi et al. (2018) and the dashed line marks the scatter of 0.4 dex found for the M sample.