Vertical gradients of the metallicity (left panel) and [Mg/Fe] (right panel) for different radial distance from the Galactic centre. The upper row shows the profile using only the APOGEE-2 data, the middle row combining them with the ‘original’ GALAH values, and the lower row combining the APOGEE-2 data with the translated GALAH data. The trends are computed as running medians in bins of 0.2 kpc, with a 50% overlap, provided that at least 20 stars are available to compute the median. The shaded areas represent the uncertainty on the median (obtained from the 16th and 84th percentile of 1000 bootstrap samples).