Period-radius relation. Stars in the SMC are plotted in red. The black solid line is a fit to the BL Her, W Vir, and RV Tau stars in the LMC (excluding 3σ outliers). The blue solid and dashed lines are the theoretical PR relations for FU and FO RRL (shorter periods) and CC in the LMC, respectively (see text). The values for the Cepheid in the eclipsing binary system OGLE-LMC-CEP-0227 (at P = 3.79 days) and the Galactic T2C κ Pav (at P = 9.08 days) are plotted as blue diamonds. Light blue stars represent the stars from Balog et al. (1997). Details about these stars are given in the text.
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