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Fig. 3

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Period–radius relation for fundamental mode Cepheids. The colour curves represent the empirical and theoretical P–R relations from the literature. Each P–R intrinsic dispersion is plotted with a thinner curve, of the same colour and symbol. The dots are our estimated linear radii, the triangles are radii converted for first overtone pulsation, and the squares represent the theoretical first overtone radii.

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