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Fig. 1

image

Evolution of the Sun during pMS and MS stages. a) solar radius (R) and coordinate of the convection zone base (rczb); b) temperature at the solar centre (Tc) and at the CZ base (Tczb); c) density at the solar centre (ρc) and at the CZ base (ρczb); d) lithium abundance in CZ in the standard model (solid line) and with additional mixing (dashed line). Grey vertical lines separate pMS and MS stages. Grey rectangles highlight time of intensive lithium burning.

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