where 𝜏 𝐷 is the correlation time for the two-dimensional translational diffusion and τres is the The water 1 H relaxometry profiles previously fitted with Eq. ( ) can actually be well reproduced also using Eq. (3) (right panels of Fig. ). In all these cases the best-fit value of 𝜏 𝑅 is in nice agreement with the expectations (25 ns in PKA, 49 ns in ANSII, 0.7 s in α7α7 proteasome, and 50 ns in BSA), whereas 𝜏 𝐷 values from few tens of picoseconds to nanoseconds and τres of the order of microseconds or longer are found. Of note, the number of fitting parameters is reduced with respect to those used in Eq. ( ). The same model has been applied to analyze the relaxation profiles of concentrated BSA solutions.