Fig. 15
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K-means clustering for log ([Ni II] 7378 Å/Hα) versus log ([Fe II] 8617 Å/Hα) diagram. Sources classified as shock-dominated are shown in orange, while photoionized sources are shown in blue. The least-squares best-fit line for all data is represented by a solid black line, and the one-to-one correlation is indicated by a dashed black line.
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