Observed spectrum (black) for a disk star (top, Arcturus) and bulge star (bottom, B3–B8). Left: line mask placements for the Mo line marked in blue and the continuum placements in yellow. Right: synthetic spectra, either in teal (top, disk star Arcturus) or red (bottom, bulge star B3–B8). The estimated S/N of both spectra, 117 and 72 respectively, are indicated in the legend. We note that the wavelength region of the rightmost figures is zoomed in with respect to the leftmost figures.