Upper panel: peak flux of the H28α transition versus peak flux of other transitions; H25α (black), H26α (red), H27α (cyan), H29α (orange), and H30α (bright green). All the plotted sources are detected in the H28α transition, and thus there are a few sources missing, which are only detected in other lines. Lower panel: peak flux of the H28α transition versus peak flux of H35β. In both plots, equal fluxes are indicated by the black dashed line, and blue lines indicate the best-fit determined by BCES bisector fits to all data points. The red line in the lower panel presents the predicted LTE value.
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