The MODELFREE-derived order parameters (S2 and Rex) for 15N-rmMBP dissolved in 30% TFE-d2 (panels A and C), and 100 mM KCl (panels B and D) at 300 K. The order parameters were determined using the globally optimized correlation times of 6.74 ± 0.09 ns (30% TFE-d2, panels A and C), and 1.26 ± 0.01 ns (100 mM KCl, panels B and D), from a Lipari-Szabo model-free analysis (76,77), with the extension of Clore et al. (78), as described in the online MODELFREE manual (80). Errors were determined on the basis of 500 Monte Carlo simulations of Brent's implementation of Powell's method for multidimensional minimization (79,80). Complete values for each residue are provided for both conditions in Data S1, Tables S2 and S3.