Comparison between the spectra of HD 45184, Inti 1, and the Sun in the region 5321–5336 Å. Panel a) shows the spectra of HD 45184 (blue open circles) and the Sun (red solid line). Panel b) shows the spectra of the Sun (red solid line) and candidate solar twin Inti 1 (blue open circles), showing a striking similarity. The different chemical composition is revealed through careful line-by-line measurements. Residuals between the Sun and HD 45184 (S-H), and the Sun and Inti 1 (S-I) are shown in the panel c) and d), respectively.