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Fig. 7.

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Fast bar model. Mean azimuthal velocity of a selection of groups in the R − ϕ projection, for |Z|< 0.5 kpc. The contours of regions with the same velocity are shown for clarity (in white). The slope of the linear fitting (ϕ, Vϕ) is shown (in black) for every R column, in units of [km s−1 deg−1]. The 3σ error of the slope is shown in a translucent region around the line.

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