\(=\left(2\ G^{2}+t_{f}\right)\text{\ erfc}\left(\frac{G}{\sqrt{t_{f}}}\right)-\frac{2\ G\ \sqrt{t_{f}}\ e^{-\frac{G^{2}}{t_{f}}}}{\sqrt{\pi}}-2\ G^{2}-\left(2\ G^{2}+t_{0}\right)\text{\ erfc}\left(\frac{G}{\sqrt{t_{0}}}\right)+\frac{2\ G\ \sqrt{t_{0}}\ e^{-\frac{G^{2}}{t_{0}}}}{\sqrt{\pi}}+2\ G^{2}\) |
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