Upper panel: the (CN−TiO),(R − I) two-color diagram, with highlighted the Demers & Battinelli (2002) selection boxes for carbon and oxygen-rich stars. Dark-red open squares are carbon stars (from Cook 1987) falling below the red giant branch tip. Lower panel displays a reproduction of the [Fe/H], log (CM0 +) diagram from Battinelli & Demers (2005b), with the new CM0+ determination for SagDIG following the proper-motion decontamination process.