This dataset contains temperature data from the TOGA/WOCE transect IX1 between Australia and Indonesia. Data have been collected since March 1987 and are ongoing. The transect is repeated approximately twice each month. Profiles are obtained approximately every 60km (a 1 degree latitude / 1.5 degree longitude grid). The data are obtained from XBTs (expendable bathythermographs) deployed via the Ship-of-Opportunity Program (SOOP) of the IOC/WMO Integrated Global Ocean Services System (IGOSS), and are now managed by the Joint Australian Facility for Ocean Observing Systems (JAFOOS), a collaborative venture between CSIRO Marine Research and the Bureau of Meteorology Research Centre (BMRC).