Radial profiles of observed minus calculated sound speed δc_s for the non-accreting models with the GS98 (left panel) and AGSS09 (right) compositions. The blue solid and dashed lines with circles indicate the results with and without overshooting, respectively. The other solid lines show the results in the literature: the red, green, and brown lines indicate the results of Zhang et al. (2019, Model SSM98 for the left panel and SSM09 for the right panel), Buldgen et al. (2019, Models “GS98-Free-OPAL” and “AGSS09-OPAL-OPAL”; see their Figure 1), and Serenelli (2013, see their Figure 1).