Left panel: relative differences between inverted and modelled sound speed as a function of the radial coordinate, for SSM1 to NSSM3. The inverted sound speed is taken from (Basu et al. 2000). Right panel: time evolution of the surface ⁷Li abundance for SSM1 to NSSM3. Horizontal black line is the present-day solar surface ⁷Li abundance as measured by Asplund et al. (2021), and the shaded area represents the associated uncertainty.