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Fig. 11

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Visual amplitudes vs. logarithmic period for Galactic and Magellanic Cepheids. Different colors indicate different metallicity ranges. Top left: the Cepheid sample was divided into two subsamples: supersolar (green circles) and subsolar (red) metallicity. Bottom left: running mean of the luminosity amplitudes plotted in the top panel: the color coding is the same as the top panel: the vertical bars display the intrinsic error of the running mean due to bin size and number of stepping stars (see text for more details). Top right: same as the top left panel, but the Cepheid sample was divided into three subsamples: supersolar (green), solar (empty black circles), and subsolar (red) metallicity. Bottom right: same as the bottom left panel, but for the three different metallicity bins adopted in the top panel.

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