Zeroth moment maps of OH emission in the J = 27/2, F' – F'' = 13 – 13 (left panels) and 14 – 14 (right panels) transitions in R Hya, S Pav, R Aql and VX Sgr as marked. Figure caption as in Fig. 22 except for the velocity intervals. The velocity intervals irr the F' – F" = 13 – 13 and 14–14 transitions are: −10.7 to −4.1 km s⁻¹ and −11.5 to −2.2 km s⁻¹ in R Hya; −21.0 to −10.4 km s⁻¹ and −21.8 to −12.5 km s⁻¹ in S Pav; 43.3 to 51.3 km s;⁻¹ and 46.6 to 51.7 km s⁻¹ in R Aql; 2.9 to 21.5 km s⁻¹ and 7.5 to 16.8 km s⁻¹ in VX Sgr. The line HPBW is (41×30) mas, (27×21) mas, (27×22) mas and (31×22) mas at PA 45°, −3°, 10° and −84° in R Aql, S Pav, R Aql and VX Sgr, respectively. The continuum HPBWs are: (34×25) mas at PA 67° (R Hya), (25×20) mas at PA 13° (S Pav), (24×22) mas at PA −13° (R Aql) and (28×20) mas at PA 89° (VX Sgr).