Mass-ratio distribution for the binary population in the ACS field of 29 GCs. Black filled-circles show the normalized fraction of binaries in five mass-ratio intervals, while red open-circles indicate the ν_bin,i values obtained by using only two bins with 0.5 < q < 0.7, and 0.7 < q < 1. Horizontal segments mark the adopted mass-ratio interval, while observational errors are plotted as the vertical lines and shadowed areas.