Left: stellar radii as a function of age for stellar evolution models with initial mass M₁ = 3.8 (gray) and M₂ = 2.7 M_⊙ (black), along with stellar merger models with progenitor initial masses 2.1 (violet), 2.2 (orange), 2.3 (blue), 2.4 (pink) and 2.5 M_⊙ (brown). The blue and red colored regions represent the measured Cepheid and red giant companion radii, respectively. Right: a closer view of the stellar radius as a function age consistent with the current age of the red giant.