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Radius of gyration (
) versus time for the P4–P6 subdomain. The points are calculated from fits to the Guinier region of the data (Guinier & Fournet, 1955 ▶), with the errors being determined by the 95% confidence intervals. The black line is the fit of the equation 
with 
, 
and 
ms. When measured by SAXS, P4–P6 folding is accurately described by a single exponential; thus the global compaction of P4–P6 is apparently a two-state process.
