Spatial distributions of the purified samples of a) C-rich AGB stars and b) O-rich AGB stars in density maps in the Galactic coordinates. The purified sample corresponds to those belonging to all the occupation zones of the  [J]  −  [K]  vs.  [K]  −  [9]  (Fig. 2a),  [K]  −  [9]  vs.  [9]  −  [18]  (Fig. 3a), and  [J]  −  [K]  vs.  [9]  −  [18]  diagrams (Fig. 4a). The color scales are linear from 0% to 100% of the peak value and given in units of deg^-2.