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Nuclear Magnetic Resonance (NMR) is a tool of choice to characterize molecular motions. In biological macromolecules, pico- to nanosecond motions, in particular, can be probed by nuclear spin relaxation rates, which depend on the time fluctuations of the orientations of spin interaction frames. For the past 40 years, relaxation rates have been successfully analyzed using the Model-Free (MF) approach, which makes no assumption on the nature of motions and reports on the effective amplitude anddoi:10.1063/5.0095910 pmid:36182415 fatcat:ugvvxoxepfg4bncaa3eb6cv53a