Typical line profiles of the (0,3,0) 8₃,₆ – 7₄,₃ transition of H₂O at 222.014 GHz in R Aql, S Pav, IRC+10011 and VX Sgr. The upper left panel in Fig. 3 shows the same transition in R Hya. Spectra are extracted for an aperture diameter of 0.′′ 08 from the extended configuration and converted from the observed frequency to the LSR frame using the H₂O catalog; line rest frequency given in Table 2. The red and blue vertical lines indicate the new LSR systemic velocity (see Table 1) corresponding to our frequency determination and to the catalog frequuncy, respectively. The spectral resolution is ~1.3 km s⁻¹.