Observed spectrum of Y CVn in the spectral range 13–14 μm (top panels: 14.0 μm, 712.55–717.70 cm⁻¹, SOFIA-EXES; bottom panels: 13.1 μm, 755.50–769.12 cm⁻¹, IRTF-TEXES). The spectra are corrected for the Doppler shift due to the relative movement between the star and the Earth at the time of the observations. The resolving power is R ≃ 67 000 at 14.0 μm and ≃ 83 000 at 13.1 μm, which provides us with a spectral resolution of ≃4.4 and 3.6 km s⁻¹, respectively. Different lines of several vibrational states of HCN (red, orange, and brown) and H¹³ CN (pink) are found in this spectrum. A model of the atmospheric transmission estimated with the atmospheric transmission calculator ATRAN (Lord 1992) is included in gray. The TEXES data were cleaned from the atmospheric lines with a routine developed by J. H. Lacy. The red and blue curves are the synthetic spectra derived from our spherically symmetric and asymmetric models, respectively.