I2⁡(x)=∑ℜ⁡β0≤ℜ⁡z≤1res⁡[-x-z⁢Γ⁡(1-z)⁢ℳ⁡(h2;z)]+12⁢π⁢ⅈ⁢∫ρ-ⅈ⁢∞ρ+ⅈ⁢∞x-z⁢Γ⁡(1-z)⁢ℳ⁡(h2;z)⁢ⅆ⁡z.