Fig. 2

Example of bar properties calculation for the gSb model. The gas density map in arbitrary unit is shown in the top left panel and the stellar density map in the bottom left panel. Comparison between the radial variation of the Fourier amplitudes A2 derived from the gas density map (dotted blue line), the stellar density map (continuous black line) and the ellipticity obtained by fitting ellipses to the stellar map (dashed red line) are shown in the top right panel. The phases are shown in the bottom right panel, lines and symbols are the same in both panels. The vertical dashed green line is the bar length estimated from the Fourier amplitudes, rA2, and the vertical black dashed line is the bar length estimated from the ellipticity, rϵ. The ellipse in the center of each map shows where the bar are located.
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