ψn⁡(β)=∫ℝnⅇ-β⁢W⁢ⅆ⁡x=(2⁢π)n/2⁢β-(n/2)-(β⁢n⁢(n-1)/4)×(Γ⁡(1+12⁢β))-n⁢∏j=1nΓ⁡(1+12⁢j⁢β).