Fig. 1
Equivalent width of (from top to bottom) the CH λ4300, CN (0,0) R(0), CH+λ4232, CN R(1), and P(1) lines in ζ Per spectra between 2003 and 2011 (filled squares correspond to McD data and filled triangles to OHP data; error bars correspond to ± 1σ uncertainties). For each absorption feature, the horizontal line indicates the weighted average computed over all W values.
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