The 'pbso'_n.dat' INSTRM=6 data file is then displayed automatically
in the main WinPLOTR Windows. Extrema values can be modified in
the 'Plot / Zoom' menu option and the number of graduations in
the 'Option / Graduations' menu option.
Drag a rectangle with the left mouse button will zoom the selected
area (This operation can also be done with the 'Plot / Zoom' option
by entering Xmin, Xmax, Ymin and Ymax values). Let's select the 22 to
62 angular 2Theta range. The 'Option / Graduations' menu option
will be helpfull to select exactly this angular range (Y graduations