Φ⁡(z,s,a)=12⁢a-s+∫0∞zx(a+x)s⁢ⅆ⁡x-2⁢∫0∞sin⁡(x⁢ln⁡z-s⁢arctan⁡(x/a))(a2+x2)s/2⁢(ⅇ2⁢π⁢x-1)⁢ⅆ⁡x,