Q⁡(a,z)P⁡(a,z)}∼za-12⁢ⅇ-zΓ⁡(a)⁢(d⁡(±χ)⁢∑k=0∞Ak⁡(χ)zk/2±∑k=1∞Bk⁡(χ)zk/2),