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EPR spectra (top) as well as field-dependent 1H (middle) and 13C (bottom) DNP profiles of various polarizing agents at 140 GHz μw frequency. TOTAPOL DNP data taken from refs. 32 (1H) and 33 (13C). SA-BDPA and trityl OX063 data from refs. 34 and 35, respectively, except 13C DNP profiles which were taken from ref. 36. Gd(III) and Mn(II) EPR spectra taken from ref. 37; DNP data from this work.
