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Proton level dependence of 1H (red) and 13C (blue) DNP at 140 GHz using Gd-DOTA as polarizing agent. Darker profiles are recorded on 13C3-glycerol/H2O (60/40 vol.%) as solvent, lighter profiles on [D8,13C3]-glycerol/D2O/H2O (60/30/10 vol.%). The insets show 20-fold vertical magnifications of 13C enhancements in the respective field region where 1H SE condition is matched.
