Radial profiles of lithium abundance. The theoretical predictions refer to the gradient at the Sun’s birth (t = 9.2 Gyr, dotted curve) and at the current time (t = 13.7 Gyr, solid line). Data for our sample of GES iDR6 field stars, chemically separated into different sub-populations only in the solar neighbourhood region, are shown in different colours. Blue, magenta, and light blue circles identify, respectively, low-α, metal-rich α-rich, and metal-rich solar-α stars. Black circles refer to stars that inhabit either the inner or the outer disc. Average maximum ⁷Li abundances for 26 OCs selected from GES iDR6 are also displayed (small colour-coded circles). The meteoritic abundance from Lodders et al. (2009) is indicated with the multiplication sign. On the top x-axis we report the current metallicity of the ISM as predicted by the model at different radii.