Spectra of selected molecular species toward HD 62542. The UV spectra are from STIS (FWHM ∼ 2.7 km s⁻¹); the optical spectra are from Keck/HIRES or VLT/UVES (FWHM ∼ 4.5–6.8 km s⁻¹). The tick marks above the spectra indicate absorption from the main component at 14 km s⁻¹. For CN λ3874.6, the R2, R1, P1, and P2 lines flank the main R0 line at that velocity; the weak unmarked features just to the right of the R1 and R0 lines are due to ¹³CN. For CO λ1392.5, lines from rotational levels J = 0–6 (in the R, Q, and P branches) are detected; see also Figures 21 and 22. For CS λ1400.9, the weak line near −80 km s⁻¹ is due to Sn II in the main 14 km s⁻¹ component. For several other cases, the “extra” tick marks give the locations of nearby lines of other species (whether or not detected).