Advanced Usage

In addition to the xassist.par file, some parameters are configured in data files stored at xassist/data/missions. There is a subdirectory there for each supported telescope and detector, with variuos files specifying different types of parameters. The files contain comments describing the parameters listed. If the user can write to the xassist/ directories, then modifying these parameters is an option but of course these changes will affect all users of that xassist installation.

For users familiar with Python, if the file xa_user.py is found in the working directory, it is loaded and the function xa_user is executed before each package is run.