Kernels for α (${\underline{K}}_{\alpha }$) as a function of acoustic depth (black and grey) for a 1 M_⊙ model with a ν_max of about 76 μHz. For comparison, we also show Γ₁, the first adiabatic exponent in red, as well as its deviation from 5/3 in the colour code just above it. For comparison, the dashed blue curve shows the radial eigenfunction of the radial mode closest to ν_max in arbitrary units.