Upper left panel: Momany et al. (2005) color–magnitude diagram along with the 80% and 50% photometric incompleteness levels. Upper right panel: μ′′ (see text) as a function of m_F814W, where open squares highlight the position of the identified carbon stars and the heavy blue line marks the separation between SagDIG and foreground stellar populations. Lower panels: resulting proper-motion separated diagrams of SagDIG and the Galactic foreground populations. Lower middle panel: 5 vector-point diagrams, in bins of 2.0 mag per subpanel, starting with m_F606W = 18.0. SagDIG selected members are highlighted as blue points whereas Galactic foreground is plotted in red.