Distribution of the hot B subdwarf pulsators in the log g − T_eff plane from a sample of 28 short-period (out of 51 known; in blue) and 33 long-period (out of 45 known; in red) sdB pulsators. Three stars in this sample show both long- and short-period pulsations (blue filled circles within a red annulus). We stress that the plotted stars form a homogeneous sample in terms of the determination of their atmospheric parameters (based on our NLTE metal-free H/He model atmospheres). On the same homogeneous scale, the green square with a cross marks the position of KIC02697388. The overplotted blue contours indicate the number of driven ℓ = 0 p-modes (the largest contour corresponds to one driven mode) and manifest the p-mode instability region derived from models assuming iron distributions at equilibrium between gravitational settling and radiative levitation (Charpinet et al. 2001). Nearly all p-mode pulsators are concentrated within the three highest contours (solid lines) where driving is most efficient.