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Fig. 2

image

Profiles of hydrogen abundance a), its gradient b) and coefficient KDc) beneath the convection zone in the present-day Sun. Dashed and solid lines describe the model with and without additional mixing, respectively. The thin, solid, horizontal line on the plot a) is hydrogen distribution at the ZAMS. The pointed line on the plot b) is inverted gradient of hydrogen abundance obtained from the observed sound-speed profile. Vertical dashed-pointed lines separate three regions with different mixing: I is convection zone, II and III are zones with additional mixing.

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