Fig. 3.
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Structure evolution (Kippenhahn) diagrams. The x-axis shows evolutionary time (unit: million years; zero point: HeZAMS), and the y-axis represents the radius. The left and right panels show the 30 M⊙ He star with and without MLT++ prescription, respectively. The green-shaded and purple-shaded regions indicate the convection zone and overshooting zone, respectively.
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