Equation Icon  ∘ --- ┌│ --- ┌│ --- 1 ˆρ2 2 │∘ ˆΔ 2 │∘ Δˆ 2 nr = -ˆ-; n τ = -2 , nϕ = − --2ˆasin 𝜃 . (104 ) Δ ˆρ ρˆ