Hi Peter Sorry, that it took a lot longer than I thought it would. The new version (ifds_2008_2i) is now available for download: http://flight-dynamics.esa.int/software/integral/isoc/ifds_2008_2i.tar.Z I have reviewed and improved the validation approach. Each software problem reported is now added to the list of test cases (verification/data). In order to support the wide time range of the test cases, which go well beyond the usual span of the orbita file, I had to package with the delivery a long (and large) orbita file. This file will be installed with the usual install script. It is expected that this file will be overwritten with the most recently delivered orbit package (FTS). Note: The large orbita file leads to extended orbit access times, i.e. applications requiring orbital information (practically all) run slower than with the normal short orbita file. Regards Frank