Gas and dust fractions of QGs. Top: selection of f_dust and f_gas measurements as a function of redshift for QGs. Circles correspond to dust derived gas fractions: this work and previous stacks studies (G18; M21) are shown in red and blue, respectively. The white circles show two different estimates (connected by a grey dotted line) for a sample of individually observed lensed galaxies. The lower values correspond to those presented in Whitaker et al. (2021a) and the upper values show the new estimates provided in Gobat et al. (2022). The grey diamonds represent CO derived f_gas estimates (Sargent et al. 2015; Bezanson et al. 2019; Williams et al. 2021). The red dashed area embeds f_gas measurements of local QGs obtained for the ATLAS3D sample (Young et al. 2011; Cappellari et al. 2013; Davis et al. 2014). The blue shaded area and the purple dashed line represent the best fit to the M21 data and the Gobat et al. (2020) model respectively. For reference, we add the f_gas evolution of main sequence galaxies according to Liu et al. (2019). Bottom: dust and gas fraction as a function of stellar mass for measurements at z ∼ 1.5. Symbols are the same as in the top panel. The dotted line shows the f_gas prediction according to the Davé et al. (2012) galaxy evolution models, color coded as a function of M_halo. For reference, we add the f_gas − M_* trend measured by Magdis et al. (2012), Liu et al. (2019). Light yellow scattered diamonds and arrows mark the f_gas detections and upper limits for local QGs, with the corresponding best fit plotted as a black dashed line.