S2 value: The generalized order parameters (S2) are calculated from 15N relaxation data
Tau e value: Internal motional time constants for models evaluated with S2 and Tau_e as fitted parameters in the final model-free analysis.
Rex value: Chemical exchange terms for residues which were fit with S2 and R_ex as fitted parameters in the final model-free analysis.
Sum-squared errors: these come from the final calculation of model-free parameters.