OBe star fraction in the SMC as a function of absolute magnitude. The red line shows the result obtained using a color–color cut with the J − [3.6] color on the x-axis (shown in Fig. 2). As a test, with a cyan line we also show the result obtained when the Gbp − Grp color is used on the x-axis instead (shown in Fig. A.5). In the grey shaded area, we do not present an OBe star fraction.