Upper panels: exemplary scatter plots for the FR-T eff relations of the two strongest correlations |r FR, T eff | in our test grid around Hβ (left) and Hα (right). The color coding is the same as in Fig. 2. Black-dashed lines resemble the linear ODR fits to the data. The small inlays at the bottom show cut-out spectra normalized by their 99th percentile for the highest (black) and lowest (gray) corresponding T eff, the former being offset by −0.1 in flux direction. Gaps in the spectra mark the expected positions of strong telluric contamination for the observed radial velocity (Sect. 2.3). The blue and green shaded regions in the inlays indicate the ranges from which the respective FRs were computed using Eqs. (1) and (2) with the values provided in the upper corner of each panel. Lower panels: residual distribution.
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