Fig. 2.
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FWHM–K2 correlation for SXTs with the best linear fit, using NIR (top panel) and optical (bottom panel; data come from Casares 2015) emission lines. Filled symbols indicate BH binaries, while NS binaries are denoted with open symbols. The shaded regions in both plots correspond to the 1σ uncertainty of the linear fit (dark grey) and the total uncertainty of the correlation that includes the result from the Monte Carlo simulation in Sect. 3 (light grey).
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