\(-\int_{t_{0}}^{t_{f}}{e^{H^{2}t+2\ G\ H}\text{\ erfc}\left(\frac{G}{\sqrt{t}}+H\sqrt{t}\right)\ dt=}-e^{2\ G\ H}\int_{t_{0}}^{t_{f}}{e^{H^{2}t}\text{\ erfc}\left(\frac{G}{\sqrt{t}}+H\sqrt{t}\right)\text{\ dt}}\) (15)