Bottom panel: comparison between the synthetic and observed spectra for V530 Lyr in the 8076–8088 Å range containing CN lines. Top three panels: ±1 Å zoom around the CN lines at 8035, 8057.3, and 8082.9 Å (from left to right panels). The green dashed lines mark the CN lines used by Merle et al. (2016) in barium stars. The grey line presents the synthesis without the CN line list. The value [N/Fe] = 0.9 has been adopted.