) and the FGR results (gold dashed line) using Eq. 17 (where the value of kVSC in Eq. 17 is re-scaled by a factor of 0.5). (c) Effective activation entropy under different ΩR values obtained from the exact HEOM simulations (blue open circles) and the FGR results (gold dashed line) using Eq. 17 (where the value of kVSC in Eq. 17 is re-scaled by a factor of 0.5).