Spectra obtained on June 1, 2018, with EXPRES. Top panel: time-series, high-resolution spectra cleaned and corrected for tellurics. The orders are stitched together for visualization, but are analyzed independently during cross-correlation. Common features such as stellar lines appear as dark columns. Inset: zoom-in of the time-series spectra between 5850 and 6000 Å (marked by the green band), revealing the broadened Na doublet. Middle panel: example 1D spectrum from the time series before (red) and after (black) telluric correction. The features around 6700 Å are an artifact of order stitching. Some strong stellar lines, including the Balmer series and the sodium D lines, are marked. Bottom panels: zoom-in of the example 1D spectrum, demonstrating the effect of telluric correction in strongly contaminated regions (contaminated by H₂O, O₂, and H₂O, from left to right).