Comparison of the mom 0 absorption and emission of water at 254.053 GHz (line 8 in Table 2). Left panel: Absorption in S Pav is delimited by the dotted -5σ contour while the ring-like emission is shown in yellow. The noise level is 3 mJy/beam km s⁻¹. Right panel: As for left panel but in R Hya. The noise level is 2.5 mJy/beam km s⁻¹ In both panels the red contour at the map center delineates the extent at half peak intensity of the continuum emission. The HPBW is (24×19) mas at PA 6° and (25×20) mas at PA −13°) for the line (white ellipse) and continuum (dark-red ellipse) in S Pav, and (39×30) mas at PA 49° (line) and (34×25) mas at PA 67° (continuum) in R Hya. (The velocity intervals are: −2.6 to 6.5 km s⁻¹ and −9.3 to −3.9 km s⁻¹ for S Pav absorption and emission; −9.2 to −2.6 km s⁻¹ and −19.1 to −10.5 km s⁻¹ for R Hya absorption and emission.)