(Left-column) Ratio of the FWZI of the H₂O 2₀₂–1₁₁ 988 GHz (top panel), 2₁₁–2₀₂ 752 GHz (middle panel) and 3₁₂–3₀₃ 1097 GHz (bottom panel) transitions and the FWZI of the ¹²CO observations as a function of the bolometric luminosity. (Right-column) Same as left-column but versus the envelope mass of each YSO. The low- and intermediate-mass sources with detected EHV components are surrounded by a box, and also the high-mass YSO with triangular line profiles. Both values of FWZI were calculated by binning the spectra to 3 km s^-1. The symbol and colour code is the same as in Fig. 2.