Figure 5. Left: a subset of profiles from the posterior distribution chosen to illustrate the idea of a compact (solid lines) versus diluted (dashed lines) core. All have comparable likelihood values. A precise value of r rD marking the difference between compact and diluted cores is hard to define (see discussion in the text). Right: a subset of profiles from the posterior distribution chosen to illustrate the possibility of continuous He abundance in the envelope (solid lines) as well as the traditional idea of helium rain separating He-poor and He-rich layers (dashed lines). Again, the likelihood values of both subsets are comparable and, again, a precise cutoff below which the curve is considered continuous is not obvious.
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