The program uses the Aspect/Attitude and Eventrate calibration files. At least one of these must be present for the program to work. In addition the program obtains timing information from the file _hdr.
The output is a textfile containing a list of ON-OFF MJDs.
After each parameter selection, a message indicating the exposure time lost due to that selection is output. When the program terminates a message indicating the total exposure time now available and the percentage excluded is output.