Radial metallicity profiles in the solar interior at 4.567 Gyr for non-accreting models (left panel) and accreting models (right panel). The red and gray lines denote the cases with the GS98 and AGSS09 compositions, respectively (models noacc-GS98-noov, noacc-GS98, noacc-noov, and noacc, from top to bottom). The target values of Z_surf at 4.567 Gyr are 0.0168 ± 0.0007 and 0.0134 ± 0.0007, respectively (see Table 3). The brown and purple lines in the right panel show the results of models MZvar and He20Myr, respectively (see Table 1 and Fig. 5).