Upper panel: areal densities of the number of the purified C-rich (red) and the O-rich (blue) AGB samples in the Galactic plane (|b| < 10°) as a function of Galactocentric distance (Rg), not corrected for the completeness (see below). For each Rg, we count the numbers of the disk AGB stars included in the annular regions of width 0.3 kpc within 8 kpc of Sun (the penetrating depth of our sample) and divide the star counts by the corresponding areas. The narrower stripes indicate the errors estimated from the Poisson statistics for the star counts, while the wider stripes indicate the ones derived by assuming uncertainties of ± 2 kpc in estimating the distance. Lower panel: completeness of both samples as a function of the Galactocentric distance (Rg).
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