Number of stars with respect to their effective temperature. The histograms in the top four rows of subpanels separate stars within the indicated range of luminosities using different colors. Cyan bins indicate fast-rotating stars with v sin i > 100 km s⁻¹. Each histogram displays the total number of stars and of fast-rotating objects (FR). Each column separate stars by their distances, as indicated in the top panel. The adopted position of the TAMS for each luminosity range is included with a vertical dashed line (see Sect. 4.1). The bottom row of subpanels displays the corresponding cumulative distribution function following the color code of the histograms.