Top: the GHOST spectrum around the Na D λλ5889.950, 5895.924 doublet in the heliocentric frame, with the stellar photosphere divided out. The thick gray line shows a three-Gaussian fit. Middle: nine individual 15 minute spectra (pink) and the mean-combined spectrum (blue) normalized to be one in the continuum as observed, including the stellar photosphere. Solid cyan line shows the rotationally broadened BOSZ template shifted to the stellar frame based on the Gaia RV, excluding the Ni I 5892.88 Å line not seen in our source. Bottom gray curve shows a telluric absorption template to demonstrate which of the small features in the observed spectrum could be telluric. The solid orange vertical line shows centroid of the photospheric absorption lines expected based on the Gaia RV, and the orange dashed line shows the centroid of the metal emission lines.