H I gas mass fraction of the sample as a function of stellar mass. The red diamonds show our sample with BAT IDs, and the purple squares show the binned mean gas fraction of the entire BASS-H I-detected sample from single-dish measurements. The black dot points are the xGASS sample (Catinella et al. 2018), and the black squares and the grey shaded regions represent the binned mean value and the 5σ scatter of the same sample, respectively.