Comparison of the solutions (a−c) for the models described in Table 3 with published observations. The blue boxes represent the values of (a−c) with uncertainties listed in Table 4 for the four models. For each model, the solutions are given with their uncertainties at first (left), second (center), and third order (right). Reported observations include Millis et al. (1987, Mi87), Thomas et al. (2005, Th05), Drummond & Christou (2008, Dr08), Carry et al. (2008, Ca08), and Drummond et al. (2014, Dr14).