Top panel: density power from the Fourier transform of a subset of the visual light curve used for the first search of periodical signal. The dataset used, between the Dean and Sterken minima, is shown as an inset with the following label: van Genderen data in black diamonds, Hipparcos data in orange stars. Bottom panel: phased light curves compared with two NIGHTFALL models. In addition to the van Genderen and Hipparcos data (i.e., the most easily prewhitened), the ASAS dataset is shown as blue crosses. The dashed horizontal lines are indicative of the deepest level of the primary and secondary eclipses, at 0.13 and 0.06 mag, with eclipse depth 0.21 and 0.14 mag, respectively. The best 1 and best 2 models are indicated as dotted and dash-dotted curves, respectively.
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