(H − K_s) − (J − K_s) CCD for the selected AGB stars and the color distributions of (H − K_s) (upper panel) and (J − K_s) (right panel). The dotted lines indicate the separation color limit between the M-giants and C stars. The green and red dots are the identified M-giants and C stars. The open circles indicate 82 C stars cross-identified in both the giJHK_s photometry (this study) and CNTiO photometry of Albert et al. (2000).