Fig. 6.

Three R_1ρ decays simulated for 20 kHz MAS, different spin-lock fields and different spin systems (indicated in the figure). ¹⁵N–¹H distance in both cases was 1.02 Å, ¹⁵N–¹⁵N distances in 4-spins structure was 2.8 Å, which corresponds to the typical distance between backbone nitrogen atoms of neighbouring residues in a protein. In all cases two-site jumps of the ¹⁵N–¹H bond with angular amplitude 5° were considered at a jump rate of 5000 s⁻¹