Depending on the extent of digitization in the second frequency domain, weak vicinal couplings (those for protons whose couplings are weak because of Karplus considerations) and longer – range couplings may or may not be observed. The observation of weaker responses is also, in part, a function of the mathematical weighting functions used in processing the data. It is entirely possible through data processing procedures to retain or eliminate weak vicinal and longer-range protonproton correlation responses. 上面就是原文，供大家参考。
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