Typical parameter values for the PR model and the equivalent parameters for the PR model with a hard switch.

These values give the appropriate parameter values for the two-process model as in (15). The derivation of the values for , and for the PR switch model are given in the Methods section. All parameters have been defined to be positive, consequently some of the signs in equations (6) are opposite to their original definitions in [17]. The mean component of the circadian drive in the PR model has been incorporated in the definition of , , .