The remaining two terms in the Hamiltonian do not relate to deformation and are present in the spherical shell model as well. The spin-orbit term represents the spin-orbit dependence of the strong nuclear force ; it is much larger than, and has the opposite sign compared to, the special-relativistic spin-orbit splitting. The purpose of the ℓ ℓ 2 term is to mock up the flat profile of the nuclear potential as a function of radius. For nuclear wavefunctions (unlike atomic wavefunctions) states with high angular momentum have their probability density concentrated at greater radii. The term − − ⟨ ⟨ ℓ ℓ 2 ⟩ ⟩ N prevents this from shifting a major shell up or down as a whole. The two adjustable constants are conventionally parametrized as c 1 = 2 κ κ ℏ ℏ ω ω 0 and c 2 = μ μ κ κ ℏ ℏ ω ω 0 . Typical values of κ and μ for heavy nuclei are 0.06 and 0.5. With this parametrization, ℏ ℏ ω ω 0 occurs as a simple scaling factor throughout all the calculations.