In our simulations, we have used values of γ 2 that are much lower than what the experimental line widths suggest (∼ 25 kHz). This was imposed by numerical issues and we were not able to perform simulations with such large γ 2 and the required small flip angles values. However, based on the above discussion, we argue now that this does not affect the relevance of our calculations ) in , with γ 2 = 25 kHz. For ratios approaching unity, the duration increases roughly a tenfold. that provide insight into these complex phenomena.