Equation Icon  ′ ′ ∑ 2l + 1 ′ Cg(n, n) = ⟨δg(n)δg(n )⟩ = ------Cg,lPl(n ⋅ n ) l 4π ∑ ∑ LM LM ′ + D g,ll′X lml′m′Rlm(n )Rl′m ′(n ). (4.5.14 ) LM lml′m′