Upper (lower) panels: maximum height above the Galactic plane, z_max, as a function of stellar mass (age) for stars with [α/Fe]≤0.1 (left panel), [α/Fe]≤0.1 and [Fe/H]≥0.2 (middle panel), and [α/Fe] > 0.1 (right panel). Colour represents [Fe/H]. Stars among the α-rich population identified as overmassive are indicated by red open circles. Black squares in the upper(lower)-left panel represent the median z_max in different mass (age) bins.