In this directory there are two additional files:

XYZplot.gplt and XYZdata.  These may be used to display a
3-Dimensional plot of the Lorenz attractor---the so-called
butterfly.  You will need to have gnuplot installed on your
system to make it work, but it's quite nice.  The comment
lines in XYZplot.gplt explain how to use it.  Basically, when
you have it set up, give the command

gnuplot XYZplot.gplt

and a window will pop up on your monitor with a display of
thel 3-D plot.  You can then use the mouse. Hold down the left
button while moving the mouse around, and the plot will rotate
before your eyes. 

If you're on a windows machine, get the windows version of
gnuplot and install it; you will also have to edit a line in
the "XYZplot.gplt" file to change "X11" to "windows", as
described in the comment lines in that file.

    -- Peter Scott, April 01, 2007