L_H2O/L_IR-ratio versus intrinsic L_IR for the H₂O detections from Omont et al. (2013) along with the H₂O detection for the Spiderweb galaxy. The grey circles are sources from Omont et al. (2013) with directed detections of the 2₀₂−1₁₁ line and the grey triangles are sources with 2₁₁−2₀₂ detection, scaled using Mrk231 as a template to get an estimate on the 2₀₂−1₁₁ luminosity. The Spiderweb galaxy is shown with the red point. We plot the summed H₂O emission of the western and eastern detection, since the IR luminosity is integrated over the full source.