m_F336W vs. m_F275W − m_F336W (left panel), m_F336W vs. m_F336W − m_F814W CMDs (middle panel), the verticalized m_F336W vs. Δ_F336W,F814W diagram (top-right panel), and the Δ_F336W,F814W cumulative distributions (bottom-right panel). The investigated binaries, selected in the left CMD and located within the shadow yellow region, are colored black, whereas the remaining stars are represented with gray dots. The gray crosses in the top-right panel are stars excluded from the analysis. The red and blue lines are the fiducial lines for equal-luminosity rMS and bMS binaries, respectively.