Radial (top) and vertical (bottom) metallicity gradients for the prograde (left) and retrograde (right) samples, split by survey. The vertical error bars correspond to the uncertainty of the fit of the gradient, whereas the horizontal error bar represents the dispersion in |Z| or R, respectively, where the gradient was measured. The size of the dots is a visual aid proportional (within each panel) to the number of stars each survey contains in the considered distance-bin.