In order to verify our theory, we recorded the 1 H DNP Zeeman field profile of a 80mM Trityl-OX063 in d6-DMSO:D2O:H2O (6:3:1) sample at wr/2p = 8 kHz and ω0I/2π = 600MHz, T=95K using a ∼ 17W gyrotron microwave source. The Zeeman field profile is shown in Figure together with a simulation performed with SpinEvolution 36 software. For simulation, typical T1e and T2e values for samples with such concentration are used. A small difference between the ZQ and DQ cross relaxation values are used in order to fit the slight asymmetry between the positive and negative RM enhancements. If the ZQ and DQ cross relaxations are the same, an antisymmetric RM DNP field profile should be obtained as shown by the dashed line in Figure . An even larger difference between the two cross relaxations would lead to an Overhauser DNP. We believe that this is presently the highest field where a distinctive RM profile is observed. Furthermore, this high nuclear Larmor frequency, quenches the TM, further confirming our argument that the center DNP field profile is due to RM rather than TM. The details of the simulation using the SpinEvolution software are provided in the SI. In SpinEvolution, the cross relaxation rates are simply defined as the relaxation of the off-diagonal elements of the density matrix as in the Solomon equations . Furthermore, if the electron-electron coupling were greater than 600MHz to allow TM, then TM would be much stronger at low fields, which is not the case. In addition, in Figure we show a Zeeman field profile recorded from a sample containing 100mM Trityl-OX063 in d6-DMSO:D2O:H2O (6:3:1) at wr/2p=