Phase lags corresponding to two sets of light curves generated as described in the text. The light curves had the following parameters (1) ﹩\alpha =0.5﹩, ﹩\beta =16﹩ s, ﹩t_{0}=0.02﹩ s. (2) ﹩\alpha =0.55﹩, ﹩\beta =16﹩ s, ﹩t_{0}=0.02﹩ s. (3) ﹩\alpha =0.6﹩, ﹩\beta =16﹩ s, ﹩t_{0}=0.02﹩ s. The two curves correspond to the lags between (1)–(2) (solid line) and (1)–(3) (dotted line).