Reduced χ2 and confidence contours as a function of galactocentric bar radius. The pitch angle for the Galactic spiral structure (left, the value from Francis & Anderson 2012), is also indicated, including one standard deviation error bars) and as a function of the 26Al drop-off exponent and the blow-out velocity (right). The 68%, 90%, and 95% confidence levels are shown by the solid, dashed, and dotted lines. For the left plot, the overall best-fit values of a = 0.35 and vbo = 220 km s-1 have been kept fixed. For the right plot, the pitch angle from Francis & Anderson (2012) (i = 5.56°) and the best-fit bar radius for fixed i = 5.56°, r0 = 4.6 kpc, has been used (see also Martinez-Valpuesta & Gerhard 2011). The blow-out velocity depends only weakly on these parameters (compare Table 1).
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