Illustrative impact of the choice of the diffusion coefficients on the CLÉS evolutionary tracks, as well as the predicted helium abundances and [N/O] ratios. Black tracks stand for models without diffusion, while models with different diffusion coefficients are colour-coded according to helium abundance (left panel) or the [N/O] ratio (right). The first and second rows of panels show the tracks computed with diffusion 1 and 2 (see text), respectively. Circles stand for fixed values, upwards oriented triangles for lower limits, and downwards oriented triangles for upper limits in [N/O].
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