Hℓ±⁡(η,ρ)=(∓ⅈ)ℓ⁢ⅇ(π⁢η/2)±ⅈ⁢σℓ⁡(η)⁢W∓ⅈ⁢η,ℓ+12⁡(∓2⁢ⅈ⁢ρ),