Zoom-in of the high-resolution spectra of N₂ (black line) and H plus H₂ (red line) in the wavelength range of 911.75–930 Å for a thermal excitation temperature of 50 K. The column density of N₂ is 10¹⁵ cm^-2 and values for H₂ and H are taken to be half of the observed column densities in the well-studied diffuse cloud toward ζ Oph, as is appropriate for the center of the cloud: N(H₂) = 2.1 × 10²⁰ and N(H) = 2.6 × 10²⁰ cm^-2. The model H₂ Doppler width is 3 km s^-1. Also shown is the H₂ + H absorption spectrum (blue) toward ζ Oph using the observed column densities for individual J levels, showing non-thermal excitation of H₂.