Gravity-mode period spacing ΔΠ₁ as a function of the pressure-mode large frequency spacing Δν. Long-cadence data (LC) have Δν ≤ 20.4   μHz. RGB stars are indicated by triangles; clump stars by diamonds; secondary clump stars by squares. Uncertainties in both parameters are smaller than the symbol size. The seismic estimate of the mass is given by the color code. Small gray crosses indicate the bumped periods ΔP_obs measured by Mosser et al. (2011a). Dotted lines are n_g isolines. The dashed line in the lower left corner indicates the formal frequency resolution limit. The upper x-axis gives an estimate of the stellar radius for a star whose ν_max is related to Δν according to the mean scaling relation ν_max = (Δν/0.28)^1.33 (both frequencies in μHz). The solid colored lines correspond to a grid of stellar models with masses of 1, 1.2 and 1.4   M_⊙, from the ZAMS to the tip of the RGB.