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Fig. 9.

image

Ratio of the de-projected semi-major axes of outer and inner rings versus the total stellar mass of the host galaxy, for a sub-sample of 103 galaxies. The horizontal dashed blue line corresponds to the expected ratio for a galaxy with a flat rotation curve and a linear treatment of its resonances (see text). With a black line we show the running mean and standard deviation of the mean, in bins of 0.25 dex. Barred and non-barred galaxies are shown with different colours and symbols.

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