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Fig. 9
Helium (left panel) and nitrogen (right panel) surface mass fraction as a function of time for models of 80 M⊙ with approximate initial rotational velocities of 0, 50, 100, 150, 200, 250, 300, 350, 400, 450, and 500 km s-1, during their core hydrogen burning evolution.
This figure is made of several images, please see below:
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