Note that the kinetic-energy densities hold ℏ ℏ 2 2 m | d ψ ψ ′ d x | 2 < ℏ ℏ 2 2 m | d ψ ψ d x | 2 everywhere because of the normalization. More significantly, the average kinetic energy is lowered by O ( ε ε ) by the deformation to ψ '.