Fig. 16
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Phase shifts vs. observation date for R Cru determined by template fitting. The long-term change in Δϕ is the signature of secular period change (cf. Sect. 5.3), whereas an oscillatory pattern among the VELOCE data is also clearly apparent. R Cru is the Cepheid with the shortest known orbital period in the MW, Porb = 237.6 days (cf. Paper II).
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