2D histograms of stars in our sample in angular momentum versus orbital energy plane. The distribution is shown for the entire sample (upper left panel) and for different metallicity slices, from the most metal-rich (upper right panel) to the most metal-poor (lower right panel). The vertical continuous line separates prograde from retrograde orbits (to the right and to the left of the line, respectively). The two dotted horizontal lines enclose the energy slice that should be dominated by in situ stars, following BK22.