Fig. 7.
Comparison between the proxies of the amplitude of the spirals used in this work (Eqs. (9)–(11)). We show the mean value per galaxy, and measurements over individual segments. The Spearman’s rank correlation coefficients (significances) are 0.62 (4.14 × 10−43) and 0.82 (0.0) for the upper and lower panels, respectively. With a red dashed line we show the linear fit to the red data points.
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