Mexar2 [Version 4.2]: A software for daily support of space mission planning

This submission concerns MEXAR2, a software tool that is currently used to synthesize the operational commands for data downlink from the on-board memory of an interplanetary space mission spacecraft to the ground stations. The tool has been in daily use by the Mission Planning Team of MARS EXPRESS at the European Space Agency since early 2005 and then updated continuously to cope with the changes in the mission. This specific submission refers to the more stable version delivered during 2009 when a number of updates have been actuated on the operational software.