Snm⁢(j)⁡(z,γ)={ψn(j)⁡(γ⁢z)+O⁡(z-2⁢ⅇ|ℑ⁡z|),j=1,2,ψn(j)⁡(γ⁢z)⁢(1+O⁡(z-1)),j=3,4.