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The MAPGEN program runs in 2 major sequences which are the input phase
and the map generation phase. The input part is performed with XView
which allows for full screen input, default values, selection from
scrollable lists and option to quit at any time. The XView windows
also tend to minimize the amount of typing and are fairly self-explanatory.
At input time, the user will need to know what input data to select from
and the basic parameters to generate the output map.
The core of the program will read the user input from the namelist file
created by the window processing, find the selected input event file,
read it, screen events according to the user criteria, bin each selected
event into the output map and write the map in a FITS format file. A
report of the program execution will by default be written on the terminal
unless the output is redirected to a file.