Color–color diagrams of Sextans A that are used to test how well we can identify OBe stars there. The catalogs that are used to build photometric colors are provided in parentheses are B12 (Bianchi et al. 2012), D02 (Dohm-Palmer et al. 2002), and H06 (Holtzman et al. 2006). Left: Color–color diagram where the color on the x-axis is constructed using the magnitude in the Hα narrow-band filter F656N. Sources that are in the box on the bottom right have colors that indicate that they are hot stars with Hα emission (i.e., OBe stars). Right: Same axes and color cuts as in Fig. A.4, but we show sources that are in the box for hot sources with Hα emission (left panel) in orange here. The presence of Hα excess in most photometric OBe sources supports their inferred OBe nature.