Diagrams showing the change of the hydrogen slope dX∕dQ as a result of hydrogen shell burning. Each number indicates the values of d X∕d Q at the moment helium burning has proceeded to Y c = 0.75 in models with different initial values for dX∕dQ, Xs and M. Unlike the models discussed in Sect. 5, hydrogen shells burning is allowed in these models. The background color indicates by what fraction d X∕d Q has increased during helium burning: fsteepen.
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