Fig. A.2.
Position in space of high- and low-extinction PNe marked with filled and open circles respectively. The black line indicates the major axis of M 31, dividing the PNe into the northeastern (NE) and southwestern (SW) halves of the M 31 disc shown in orange and green, respectively. The black ellipses show RGC = 10 kpc (inner), 20 kpc (middle), and 30 kpc (outer). North is up, east is right.
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