Equivalent isotropic luminosities and 3σ upper limits (arrows) for all 61 sources detected in one or both of the 1.6 GHz OH and 22 GHz H₂O maser species, with 35 detected in H₂O only (x) and 18 in OH only (+). The circle diameters are proportional to the source redshift. The OH MM sources tend to have a higher redshift. Masers of both species may be found in up to 8 sources (solid squares; source names given), with the caveat that the OH KM in UGC 5101 and IRAS 17526+3253 reported by Martin et al. (1989) were not detected in later (or earlier) observations. The inset shows OH and H₂O luminosities or 3σ upper limits against redshift for the 61 detected sources and for 34 sources undetected in either species. The H₂O and OH detection thresholds (solid and dashed lines) assume 1.0 mJy rms and a 2.0 km s^-1 FWHM.