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In water flip-back element a hard readout {{90}} pulse on {{1H}} is preceded by a selective {{90}} pulse on water resonance with phase opposite to that of the [[hard pulse]].

If {{1H}} magnetization was along z axis before the selective pulse, water resonance will stay along z and won't be observed.

==References==
<biblio>
#wfb bibtex=@article{grzesiek1993ins,
  title={{The importance of not saturating water in protein NMR. Application to sensitivity enhancement and NOE measurements}},
  author={Grzesiek, S. and Bax, A.},
  journal={Journal of the American Chemical Society},
  volume={115},
  number={26},
  pages={12593--12594},
  year={1993},
  publisher={American Chemical Society},
  url={http://dx.doi.org/10.1021/ja00079a052}
}
</biblio>
[[Category:NMR concept]]
[[Category:Water suppression]]

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