Fig. A.1.
High- (blue) and low- (red) extinction PNe overlaid on the de-projected LOS extinction (AV) map of the inner region of M 31 from Blaña et al. (2018). The elliptical rings show 5 (dotted), 10 (dashed), and 15 (solid) kpc de-projected distances from the centre of M 31. Both the high- and low-extinction PNe are not spatially correlated with the distribution of LOS extinction in the M 31 disc.
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