Bottom panel: overview of the ν₁₇ band, centered around 368 cm⁻¹, recorded at 3 μbar pressure. Residual water lines were blanked out from the spectrum. The molecular geometry of aminoacetonitrile is also shown with carbon in black, nitrogen in blue, and hydrogen in white. Top left panel: detail of the ^RQ₉ branch. The black curve is the experimental spectrum. The blue lines represent the position and the intensity of the ^RQ₉ components, while the red lines represent other ^RR transitions. Top right panel: Loomis-Wood diagram of the ^RQ₉ branch using the same color legend. The wavenumber axis of the spectra (x) is plotted against consecutive J transitions across the y-axis; each row of the plot is 0.02 cm⁻¹ wide. The height of the triangles is proportional to the spectral line intensity.