Heat capacity and native contact fraction expectation curves offer complementary perspectives on folding behavior-the former based solely on thermodynamic data, and the latter on both structural and thermodynamic data. Generally, we see excellent agreement between melting points computed from heat capacity curves and those computed from the sigmoid fit to the native contacts curve. However, some limitations with the current method of describing native contacts are apparent when comparing the two cooperativity metrics, sigmoid width parameter and heat capacity FWHM. For example, when varying the sidechain equilibrium angle (θ S,o ), the heat capacity curve shows no change in FWHM from 120 • to 137.5 • , whereas the native contacts sigmoid width exhibits a maximum at 127.5 • (Figure ).