Fig. 3

Upper panel: strong CN molecular band at 4215 Å (B-X system), lower panel: example of the CN molecular band seen in the redder part of the spectrum. In both cases, solid red lines show the best fit of log ϵ(N) = 7.07, dashed blue lines show nitrogen values ±0.20 from that fit, and solid gray lines what the spectrum would look like without any molecular CN lines. Note that the scale on the y-axis is not the same for both panels.
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