Evolution of selected quantities and trends of the eigenmodes. Top panels: evolution of the NS enclosed mass M_NS and radius R_NS sampled at a rest-mass density of ρ = 10¹² g cm⁻³. Bottom panel: dependencies of the f- and g₁-mode frequencies (magenta and blue dots) with respect to the mean density and surface gravity, respectively, along with the corresponding f- and g₁-mode fit expressions (2).