Part 2:Validation for line lists generated for nitric acid (H14N16O3) for the ν1 band and its first two associated hot bands (ν1+ν9-ν9, ν1+ν7-ν7) in the 2.8 μm region, the ν1-ν9, ν1+ν9 and ν1+ν7 bands at 3.2 μm, 2.5 μm and 2.4 μm, respectively

Fits to a solar occultation spectrum measured at 21.7 km tangent altitude from balloon above Esrange, Sweden in Dec. 1999 (Black points). The residual trace represents the difference of the measured and calculated transmittances. Colored lines represent the contributions of individual gases (Red: HNO3; Yellow: CO2; Green: H2O; Blue: Other). The HITRAN 2020 line list was used to represent the non-HNO3 absorptions -- mainly CO2 and H2O. For the HNO3 line list we used: (a) HITRAN (i.e., none), (b) ExoMol computed for 220K, (c) the JPL empirical pseudo-line-list, and (d) the HNO3 line list from this work. Each panel shows improved spectral fits compared with the previous panel, from 8.84% RMS in panel (a) to 1.77% RMS in panel (d).