J-PLUS magnitude differences between solar-scaled and α-enhanced BaSTI models for MSTO stars. We selected three stellar pairs at [M/H] = −0.1 dex, with approximate ages of 2.5, 5.0, and 10 Gyr and corresponding masses of 1.3, 1.1, and 1.0 M_⊙, respectively. The horizontal dashed line indicates the upper limit of the median absolutemagnitude error, as averaged from the third column of Table 1.