The ISO-SWS spectrum of NML Cyg

The high resolution spectrum of NML Cyg observed with the ISO-SWS in its slow-speed grating mode (2.4-45 m) shows a wealth of features never seen before in previous observations. These include ro-vibrational lines of H2O at 2.7 and 6.2 m, of OH between 3 and 3.5 m and a deep absorption band of CO2 at 4.26 m. We also report on the detection of pure rotational emission lines of H2O between 35 and 45 m and of the 34.6 m absorption line of OH which is thought to pump the well known 1612 MHz OH maser line. There are two, as yet, unidentified features at 33 and 40 m which may be related to silicate dust.