Table 2: Subsamples of Main-Sequence stars (classes V, IV-V and IV): the mean radii  ${\overline R}/R_\odot $ and the mean masses  ${\overline\mathscr{M}}/\ensuremath{\mathscr{M}_\odot} $ are derived from Habets & Heintze (1981), as well as the relative variation of the radius $\Delta R$ and of the mass  $\Delta\mathscr{M}$ along the interval of spectral type. For each subsample, the number of stars is given.
Spec. types ${\overline R}/R_\odot $ $\Delta R$ (%) ${\overline\mathscr{M}}/\ensuremath{\mathscr{M}_\odot} $ $\Delta\mathscr{M}$ (%) # stars
B9 1.95 - 2.34 - 198
A0-A1 1.79 $\pm 0.8$ 2.04 $\pm 1.5$ 397
A2-A3 1.70 $\pm 1.2$ 1.90 $\pm 2.1$ 377
A4-A6 1.60 $\pm 2.5$ 1.73 $\pm 3.8$ 182
A7-A9 1.48 $\pm 2.7$ 1.52 $\pm 4.3$ 190
F0-F2 1.37 $\pm 2.2$ 1.37 $\pm 2.2$ 197

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