Comparison of the original band and the first vibronic band of C₁₇H⁺ chain measured at 6407±3 Å and 6311–6321 Å, respectively, by Marlton et al. (2022, Fig. 5 (top)); and, (bottom), (i) the very broad DIB at 6412.37±0.96 Å, and (ii) the possible very broad DIB observed at about 6314 Å (both are marked by red arrows). The displayed DIB spectrum in the sight line of HD 183143 is copied from the published DIB spectral atlas published by Hobbs et al. (2009). The vertical blue line marks the position of the wavelength of the original band of C₁₇H⁺ chain within the reported spectrum of HD 183143. The horizontal blue and red double arrows show the reported uncertainties on the measured values of the wavelengths of the origin band of C₁₇H⁺ and of the APO DIB λ6412, respectively.