Detection distance bias shown as the beam S/N vs the distance to the galaxies, for APEX- (red), CARMA- (yellow), CARMA (D+E)- (green empty), ACA- (blue) observed galaxies. The black dashed line indicates a S/N=3 that marks the separation between detections and nondetections. Non-detections (observations with S/N<3) starkly decrease from a distance >130 Mpc and are all related to APEX observations.