εs⁢Ie2⁢m⁡(z,h)=(-1)s⁢∑ℓ=0∞(-1)ℓ⁢A2⁢ℓ2⁢m⁡(h2)A2⁢s2⁢m⁡(h2)⁢(Iℓ-s⁡(h⁢ⅇ-z)⁢Iℓ+s⁡(h⁢ⅇz)+Iℓ+s⁡(h⁢ⅇ-z)⁢Iℓ-s⁡(h⁢ⅇz)),