Comparison of binary fractions in the SMC field and Galactic populations. Panel a: binary fraction with q > 0.6 as a function of the logarithm of cluster age. Galactic OCs are color-coded by their metallicity, as indicated by the colorbar on the right, while the orange diamond marks the binary fraction in the field of the SMC. The binary fractions and ages for OCs are from Cordoni et al. (2023) and Dias et al. (2021), respectively. Panel b: total binary fraction as a function of the mass of the primary star. Gray dots are taken from the review by Offner et al. (2023), and the orange diamond indicates the binary fraction measured for the SMC field in this work.