High resolution channel map of J = 27/2, F' – F" = 13 – 13 and 14–14 transitions of OH in R Aql (upper and lower panels, respectively). Figure caption as in Fig. 21 except for the beam widths and the velocity range. The line peak flux density and r.m.s. noise levels are ~5 and 1 mJy/beam, respectively. The line and continuum HPBWs are (27×22) mas at PA 18° and (24×22) mas at PA −13°, respectively.