 levels auto 10
  set style data lines
  set title "3D gnuplot demo - contour of data grid plotting"
  set xlabel "X axis"
  set xrange [ 0.00000 : 15.0000 ] noreverse nowriteback
  set ylabel "Y axis"
  set yrange [ 0.00000 : 15.0000 ] noreverse nowriteback
  set zlabel "Z axis"
  set zlabel  offset character 1, 0, 0 font "" textcolor lt -1 norotate
  set zrange [ -1.20000 : 1.20000 ] noreverse nowriteback

  # "glass.dat" is defined below
  splot "glass.dat" using 1
</script>

<script
  type="application/