Flux-weighted gravity-period relation of fundamental mode classical Cepheids. Solar metallicity predictions (Z = 0.014) are shown using different line styles (dash-dotted, solid, and dashed) for different initial rotation rates (non-rotating, average, fast), while crossing numbers (first, second, and third) are distinguished using color (magenta, cyan, and black). Empirical values based on spectroscopic observations of Milky Way Cepheids by Luck & Andrievsky (2004), Andrievsky et al. (2005), and Kovtyukh et al. (2005) are shown as circles. FWG time-series data are drawn as transparent circles. Solid circles show the average of sinusoidal fits to the time-series data, with error bars indicating the amplitude of the fitted sine function.
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