Metallicity as a function of redistribution efficiency, comparing 1D modelling to our 3D GCMs. The GCM outputs are shown by coloured markers, where marker styles indicate the drag strength in each model: from right to left t_drag = 10³s (triangles), 10⁴s (squares), 10⁶ s (hexagon), and no-drag (circles). Markers are also coloured by χ² between the corresponding GCM phase curve and our HST/WFC3 phase curve. Retrieved redistribution efficiencies from Arcangeli et al. (2018) are shown by black contours; the same contours, including a systematic uncertainty on the equilibrium temperature of 44 K, are shown in grey.