15.64.49.11  REVERSE    - If  this is specified before any data is plotter
it makes the scale go from large to small rather than small to large.  For
example  the limits on the x scale are 0.0 and 1.1.  The left hand side of
the X axis would be 0.0 and the right would be  1.0.   REVERSE  makes  the
left hand side 1.0 and the right hand side 0.0.

If this is specified for 3-d plots after the data is plotted, it moves the
origin  of  the axes to the other side of the specified axis.  For example
the following will plot axes along the sides of a 3-d cube.
     TD:plot axes
     TD:set scale x reverse y reverse;plot axes
     TD:set scale x reverse=off y reverse z reverse;plot axes
     TD:set scale x reverse=on y reverse=off;plot axes