Please read:
* Myint, W. & Ishima, R., Chemical exchange effects during refocusing pulses in constant-time CPMG relaxation dispersion experiments. ''J Biomol Nmr.'', 2009. ([http://dx.doi.org/10.1007/s10858-009-9344-9 10.1007/s10858-009-9344-9]).
* Bain, A. D., Kumar Anand, C. & Nie, Z., Exact solution of the CPMG pulse sequence with phase variation down the echo train: application to R(2) measurements. ''J. Magn. Reson.'', 2011), ([http://dx.doi.org/10.1016/j.jmr.2011.01.009 10.1016/j.jmr.2011.01.009]).
'''Differential relaxation effects''':<br>