Top: fraction of stars missing in the solar cylinder of 300 pc radius and 1 kpc height below the midplane. The orange line corresponds to the contribution from the low-quality stars, and the green curve gives an upper limit on the fraction of stars that did not enter the final sample because of the missing chemical abundances. The total fraction of missing stars is shown in blue. Bottom: total fraction of the missing stars as a function of absolute G magnitude and G − K_s colour.