Relative abundances observed in the Galaxy (orange circles, Jenkins 2009), SMC (yellow squares, Tchernyshyov et al. 2015; Jenkins & Wallerstein 2017), LMC (green triangles, Tchernyshyov et al. 2015), and DLAs (blue diamonds, De Cia et al. 2016). The [Zn/Fe] is a proxy for the dust content, while the [X/Zn] traces the dust depletion of element X. The solid lines are from De Cia et al. (2016) and were derived from a linear fit to the Galactic and DLA data, not including the Magellanic Clouds, where the intrinsic scatter is marked by the dotted lines.