15.64.65.5  Labels   - Normally space for labels is allocated according to
the current AXES, and LABEL settings.  For example if you SET LABELS  LEFT
OFF, no space will be allocated for labels on the left side, so the window
will be larger.  If you need to have several plots all  sharing  the  same
scale,  use  either  negative  windows or absolute windows.  For example 2
plots which share the same X axis may be plotted.
     TD:SET WINDOW Y 1.2 OF -2.6
     TD:PLOT SET=1
     TD:SET LABELS BOTTOM OFF
     TD:SET WINDOW Y 2.2
     TD:PLOT SET=2
Only 1 bottom axes is plotted for both windows.

It is assumed that LEFT or RIGHT labels will occupy 6 characters.  If this
is incorrect you may adjust this value when you set the  window  with  the
CHARACTERS parameter.
     TD:SET LABEL CHARACTERS=4
allocates  only  4  characters for the labels.  This gives you more usable
plotting area.