Illustration of the opacity adjustment to reconcile the two metallicity mixtures, as explained in Sect. 4.3. Solar models computed with the revised mixture (A09) are in tension with helioseismic inferences, when compared to those computed with the ‘old’ mixture GS98 (see Fig. 4, Table 2 and text). A proposed approach to resolve the tension is to consider an appropriate opacity adjustment (κ^(new)) on top of the A09 profile (κ^(A09)), as shown in the above (black, solid curve). The shaded blue band shows the typical uncertainty of ±5%, as discussed in Sect. 4. For comparison, the inset plot shows the induced change in the opacity profile under the fifth force computed with the GS98 metallicity mixture and unmodified opacity. The horizontal axis of log-temperature corresponds to a radial range between ∼0.0002 − 0.73 R_⊙.