Phase-twisted lineshapes, avoiding

In conventional two-dimensional Hartmann-Hahn experiments, only the transfer of a single magnetization component a is used. In order to avoid phase-twisted lineshapes, the orthogonal magnetization components B and y are eliminated with the use of trim pulses or other filters (see Section XII). If two magnetization components can be transferred with identical transfer functions 7) (t) = the sensitivity of multidimen-... 

This is two lines, located at (+X21,+f22) and (-f2,+f22), but in contrast to the above both have the double absorption lineshape. There is still lack of frequency discrimination, but the undesirable phase-twist lineshape has been avoided. 

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