The display widget contains multiple optionsfor different pollutants (if defined), data grids, levels, and contour options. These are discussed in more detail in the
graphics section. For this example, accept the defaults and just click on Execute Display. If the Ghostview Postscript
viewer has been installed and properly associated with .ps files, then it will be automatically invoked by the GUI. If the
viewer does not open, it may be necessary to manually edit the file hysplit4.tcl for the directory entry associated with
the program gsview32.exe. The output file can be printed directly on any Postscript device or printed through
Ghostscript/Ghostview. The 12 hour average air concentration for a one hour release is shown in the illustration below.