The reference for the NS CPMG 2-site expanded model is:
* Tollinger, M., Skrynnikov, N. R., Mulder, F. A. A., Forman-Kay, J. D., and Kay, L. E. (2001). Slow dynamics in folded and unfolded states of an sh3 domain. ''J. Am. Chem. Soc.'', '''123'''(46), 11341-11352. ([http{{#lst://dx.doi.org/10.1021/ja011300z 10.1021/ja011300z]).Citations|Tollinger01}}
== Code origin ==