Fitzkee NC, Torchia DA, Bax A. (2011) Protein Sci 20:500–512.

A typographical error is present in both Eqs (1a) and (1b). These equations should read:

  • equation image(1a)
  • equation image(1b)

Note that a minus sign now precedes R1W in both the denominator and in the second exponential term. The corresponding equation in the supporting information (S11) is correct as published. The error does not affect any of the data analysis in the manuscript, which was carried out with the correct equation. We regret any confusion this may have caused, and we thank Sanne Nabuurs and Jia Xu for identifying the error.