Extracted spectra (F_obs) in both e2ds (top panel) and s1d (middle panel) formats, and the synthetic stellar spectrum (F_mod, bottom panel) used in the cross-correlation. The units e⁻ are photoelectrons. A zoom around wavelengths 538.2–533.2 nm (order 43) is shown in blue and the right-hand panels. These plots show the dense forest of spectral lines in our dataset. The continuum variation in the e2ds format is the uncorrected blaze function, while in the s1d format we see the residual low order instrument response in our non-flux calibrated data.