Illustration of the effect of near degeneracy on two coupled ℓ = 2 multiplets as the core rotation rate ν_c = Ω_core/2π increases for a fixed inclination angle of i = 42°. Each horizontally modelled PSD shows the combined visibility profile of the ten components (two sets of m = −2, −1, 0, +1, +2 modes) at a given ν_c. The greyscale background indicates how the multiplet structure evolves continuously with rotation.