Fraction of binaries with q > 0.5 as function of the radial distance from the center of NGC 288 (the radial distance, R, is normalized by the half-light radius, R_hl). Gray circles are measurements from Milone et al. (2012), and black diamond and triangle refer to the binary fraction measured in the magnitude range 19.0 ≤ m_F814W ≤ 23 and 19.5 ≤ m_F606W ≤ 24, respectively. The dotted blue line marks the core radius (1.35 arcmin). Horizontal and vertical black lines represent the radial coverage of each data point and the uncertainty associated with the measured fraction of binaries, respectively.