Install 
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In order to Install create the destination directory (ex. : mkdir tsu) copy the file tsu.tgz
in the destination directory and type :

"tar xvfz tsu.tgz"

Plot
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The "plot" program runs under XWindow Server.

In order to run it, please, insert the Seats/Tramo <INSTALLDIR> in the path 
and set  the environment variable PGPLOT_FONT=<INSTALLDIR>/grfont.dat