Radial location of the nodes (red symbols connected by a dashed line) and anti-nodes (blue symbols connected by a dashed line) that are closest to the super-adiabatic peak, for each radial mode between n = 16 and n = 30. The vertical black line represents the maximum of the super-adiabatic peak, where the excitation is most efficient. Horizontal black dotted lines are added for readability only.