Seismic HR diagram defined with the new indicators Δ_0l and computed along the grid presented in Sect. 3.1. The masses increase from right to left. The red marker shows the observed value corrected for the surface effects following Kjeldsen et al. (2008)’s prescription. The thick line represents the track for 1.06 M_⊙. The blue line has been computed for Y₀ = 0.27, the orange one for α_MLT = 1.5, and the pink one for (Z/X)₀ = 0.018. All the coloured lines have been computed for 1.06 M_⊙.