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Fig. 6


BTFR color-coded by HI profile shape. The datapoints are the same as in Fig. 2 but are color-coded according to the kurtosis of their HI line profile (see Sect. 4.1). Errorbars have been omitted for clarity. Shades of red correspond to high-kurtosis (“peaked”) profiles, while shades of blue correspond to low-kurtosis (“double-horned”) profiles. The dotted line is the linear fit to the overall α.btfr sample (same as in Fig. 2), while the dashed line is a fit to the low-kurtosis subsample of α.btfr galaxies with k4< −1.20. The corresponding slopes are α = 3.75 ± 0.11 and 4.13 ± 0.15, respectively.

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