Fig. 3
Spectrograms of the m = 2 Fourier mode. Top left plot: integration on 9 Gyr from 0.5 Gyr to 9.5 Gyr. Other plots: integrations on 1 Gyr centred on the times specified in the plots. The black curves are Ω(R) (solid), 
(dot-dashed), 
(dashed). The horizontal line represents the estimate of the bar pattern speed. The vertical lines represent the estimates of the bar ILR (blue), corotation (red), and OLR (green) radii.
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