title: splot 3D plots with equal scale on x, y, z
body: <p>The splot function from gnuplot that I use shows different scales of x, y and z axis. So, the final plot is often stretched along one axis. How could I specify that I want equal scale along all three axis?</p>
  
  <p>I read that 'set size square' does the job in 2D, but I wonder how could this be achieved with splot (3D).</p>