Top panels: dynamically evolved star formation histories, i.e., the stellar mass formed as a function of age and total metallicity ([Z/H]), for the ks_thick (left) and ks_thin (right) discs. Middle panels: same as top panels but including contour lines indicating the signal-to-noise ratio (S/N) of the resulting deSFH. Bottom panels: age and metallicity distribution of living stars in the volume analysed. The colour code indicates now the number of stars per bin in a 100 × 100 grid. In top and bottom panels: red dotted lines mark key age and metallicity values (11, 10, 8, 7, 6, 4 and 3 Gyr) and metallicity values (from 0 to −0.4 in steps of 0.1 dex). The contour lines enclose the 10%, 25%, 50%, 75%, and 95% of M_⊙ Gyr⁻¹ dex⁻¹ (top) and the number of stars (bottom) within the age range of 13.5 to 8 Gyr and metallicity range of [Z/H] between −2 and −0.4, highlighting the structure within this region of parameter space.