The 'File / Open Buffer file' menu option
loads this 'tb2pd2sn.buf" buffer file, and leads to open the
format dialog box to select the common data file format.
All the 20 INSTRM=0 data file are then displayed automatically in the main WinPLOTR
Windows. Of course, the 'max_courbes' parameter
has to be declared larger or equal to 20 in the 'winplotr.set' settings file.