On May 7 at ISAS the Thermal Test Model (TTM) of the Extensible Optical Bench (EOB) underwent a “bake-out” operation (by Nippi co. Ltd.). When fully extended, the EOB measures about six meters long, and looks something like a ladder. High energy X-ray detectors are attached in front of the EOB. The EOB is needed, because in order to collect high energy X-rays the telescope and the detectors must be separated by 12 meters. The EOB is only about one meter long before it has been extended, and during the “bake-out” it was in this unextended state. The picture shows some of the preparations for the operation. After these preparations, the TTM of the EOB was held for about 3 days in a vacuum while being maintained at a temperature of around 60 degrees centigrade. This allowed for all sorts of organic substances sticking to the EOF/TTM to be removed. The EOB was then returned to Nippi where heaters, temperature sensors and thermal regulation jackets were attached. It was then shipped to the Tsukuba test center.