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Table 4

Diagnostic lines used for the line-broadening characterization of our final sample.

Line O III 5592 Si III 4552 He I (a) N V 4603 He II 4541
# Stars 8 9 42 2 2
% Sample 12% 14% 67% 3% 3%

Notes. (a) unweighted average of nebular free or weakly contaminated He 4713, 4922, 4387 and/or 4471 lines (whenever present).

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