Seismic parameters distribution and dependence on log g for the R^a/R ratio. Top row: Global seismic parameters for the investigated sample. Green symbols identify stars with R^a/R < 0.85. Orange symbols identify RC stars with a mass lower than 0.75 M_⊙. Bottom row: Dependence on log g for RGB stars in different mass bins. The dotted and dashed lines are a smoother of the sample with M > 0.95 M_⊙ and M < 0.95 M_⊙, respectively.