ζ = I_core/I as a function (ν  −  ν₀)/Δν for all l = 1 modes for model M1 (top panel) and for model M2 (bottom panel). ν₀ is the frequency of the closest radial mode for the l = 1 mode with frequency ν. For model M1, blue dots correspond to modes with 9 < ν/Δν < 15, magenta dots to modes with ν/Δν > 15, and green dots to modes with ν/Δν < 9). For model M2, blue dots correspond to modes with 8 < ν/Δν < 12, magenta dots to modes with ν/Δν > 12, and green dots to modes with ν/Δν < 8).