Fig. 7

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Variation in the R21 ratios with Galactocentric distance, Rg. The orange values refer to 1 kpc bins; the straight orange lines connecting them give the unweighted mean value within a bin, and the dispersion indicates the propagated uncertainty. The green values, weighted by the square of the uncertainties, correspond to 1 kpc bins. Values of R21 > 2.2 are not shown here, and values of Rg < 14 kpc are obtained from previous measurements (Handa et al. 1993, 1999; Sakamoto et al. 1995; Hasegawa 1997; Usuda et al. 1999). The horizontal dotted black line denotes a value of R21 = 0.7.
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