**Table 5:** Estimated bandwidth for the kernel method and mean integrated squared error: for each subsample, the size n (number of stars) is given, as well as the estimated $\hat{h}$ according to Sheather & Jones (1991), computed in the logarithmic velocity scale, and the variability band width $\epsilon$ (Eq. (C.4)).
Subsample	n	$\hat{h}$	$\epsilon$
B9	125	0.223	0.0503
A0-A1	271	0.147	0.0421
A2-A3	258	0.170	0.0401
A4-A6	137	0.152	0.0583
A7-A9	141	0.137	0.0604
F0-F2	150	0.149	0.0561

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