Mκ,μ⁡(x)=2⁢μ⁢xX⁢(4⁢μ2⁢x2⁢μ2-κ⁢x+μ⁢X)μ⁢(2⁢(μ-κ)X+x-2⁢κ)κ⁢ⅇ12⁢X-μ⁢(1+O⁡(1μ)),