Fig. B.1.
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Summary of detection of key diagnostic lines from different N ions in the stars from the sample (Sect. 2). From left to right, and top to bottom: detections of key diagnostic lines from N II, N III, N IV, and N V, respectively. Filled black, gray, and empty gray symbols for stars displaying strong, weak and no lines, respectively. Circle and star symbols for stars with log Q ≤ 12.7 and log Q > 12.7, respectively. Dotted lines indicate the final selection criteria; area marked as "C" corresponds to the final analyzed stars.
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