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Thermal coefficients for Ψcomp (top) and ΨBP (bottom). The chemical shift for each proton was plotted as a function of temperature at which the spectrum was acquired. The value (in ppb/°C) for each imino proton is shown next to its position in the sequence. Positive thermal coefficients correlate with rapid exchange and negative thermal coefficients correlate with hydrogen bonding (Nonin et al. 1995). See text for further details.
