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Fig. 2

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Location of the 2ω1 = ω0 + ω2 resonance centre (dotted line) and the computed resonant multi-mode F+1O Cepheid models (within the circle) in the HR diagram. The loci of other resonance centres are also shown. The thick and thin solid lines enclose the fundamental and first overtone instability strips. The dashed lines are the lines of the constant period (F-mode) indicated in the figure. Computations were done for set R2 of Table 1.

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