Left column: Size evolution of disc galaxies using as a proxy the radial location of the edge of the star forming discs (R_edge; see left blue axis). We also show the evolution of the stellar mass surface density at the edge (Σ_edge; see right green axis). The solid lines show the evolution corresponding to a disc galaxy with the stellar mass of the MW (i.e. M_stellar ∼ 5 × 10¹⁰ M_⊙) according to the best linear fitting to the entire population (see text for details). The dashed lines correspond to the average properties of galaxies within the stellar mass range 3 × 10¹⁰ < M/M_⊙ < 7 × 10¹⁰. The redshift of each data point corresponds to the median value of the galaxy redshifts for each redshift bin. MW-like galaxies increase on average their sizes by a factor of ∼2 since z = 1. The stellar mass surface density at the end of their star forming discs (Σ_edge) decreased by an order of magnitude since that epoch. Right column: Evolution of the size of the galaxies in our sample using as a size indicator either the edge of the star forming discs (R_edge; blue points) or its effective radius (r_e, OS; purple points with the subscript OS indicating the galaxies of Our Sample). In the upper panel this evolution is fitted using a power-law function of the Hubble parameter H(z) while in the lower panel we use a power-law function of the inverse of the scale factor (i.e. (1 + z)). We add for comparison the evolution of the effective radius for the general population of star forming galaxies given in van der Wel et al. (2014).