Top: example of a synthetic hydrogen profile (solid line). The blue dot represents the surface. This model has a slope of d X∕dQ = 3.0 and surface hydrogen fraction Xs = 0.4. Bottom: hydrogen profile of a 40 M⊙ star model near the end of core hydrogen burning. Plotted in red is the fitted slope of d X∕d Q= 2.1. The part of the profile that was used for fitting is displayed with a dashed line, the rest is displayed with a dash-dotted line. For comparison, the mass coordinate m (in units of M⊙) is also displayed at the top of this panel.
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