Procedure for selecting and characterizing the binaries used to infer the incidence of 1P and 2P binaries. Left: zoomed-in view of the m_F606W vs. (m_F606W − m_F160W)−0.35(m_F110W− m_F160W) diagram at the bottom of the MS. Middle: m_F160W vs. m_F110W−m_F160W CMD. Right: verticalized m_F160W vs. Δ_{F110W, F160W} diagram (top) and the Δ_{F110W, F160W} cumulative distribution (bottom) for the probable binaries. The probable binaries, which are represented with stars, are selected from the left-panel diagram, where they lie within the yellow-shaded area of the CMD. The solid red and blue lines are the fiducials of 1P and 2P stars, and the dotted lines mark the corresponding loci of equal-mass binaries. See the text for details.