\begin{align}
\mathcal{S}_T \approx \frac{\rho}{2}\frac{\varepsilon^{H+1/2}\eta}{(1/2-H)T}\Big(1-\frac{(1-e^{\frac{H-1/2}{\varepsilon}T})\varepsilon}{(1/2-H)T}\Big), \label{one-fac_skew_form}
\end{align}
