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Statistical analyses of several Delta Scuti stars (FG Vir, 44 Tau, BL Cam andothers) show that the photometrically observed frequencies cluster around thefrequencies of the radial modes over many radial orders. The observedregularities can be partly explained by modes trapped in the stellar envelope.This mode selection mechanism was already proposed by Dziembowski & Krolikowska(1990) and was shown to be efficient for l=1 modes. New pulsation modelcalculations confirm the observed regularities. We present the s-f diagram,which compares the average separation of the radial frequencies (s) with thefrequency of the lowest unstable radial mode (f). The diagram provides anestimate for the log g value of the observed star, if we assume that thecenters of the observed frequency clusters correspond to the radial modefrequencies. This assumption is confirmed by examples of well-studied DeltaScuti variables in which radial modes were definitely identified.

Regularities in the frequency spacings of Delta Scuti stars and the s-f Diagram