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Pulse sequences mentioned in the text. Filled rectangles represent excitation or flip-back pulses. The 1H–13C CP-MAS experiment (a) does not benefit significantly from OCEX pulses as the excitation pulse is on the 1H channel. For the 13C-direction excitation (b) and PDSD/DARR (c) experiments, the pulses replaced with OCEX and OCFB pulses are indicated with an asterisk (*).
