Magellan/FIRE echelle spectrum of EUCL J0522, one of the brightest z ∼ 7.5 quasars in this work (J_E ≈ 22.17). The total integration time is 11 700 s. The black line shows the observed spectrum, inverse-variance smoothed with a 31 pixel boxcar. The light red curve shows the smoothed noise vector. The blue curve represents the best-fit power-law continuum. Locations of typical emission lines seen in a quasar spectrum are marked by vertical dashed lines, including Lyα, N V, Si IV, C IV, CIII], and Mg II. Grey shaded regions indicate wavelength ranges heavily affected by telluric absorption. The inset displays the C IV region with the best-fit emission-line model generated using Sculptor, showing the individual C IV component (yellow), continuum (blue), and combined fit (red).