title: Adding vertical lines to 3D gnuplot graph
body: <p>In the following trivial 3D gnuplot scatter graph, there are two points (labeled A and B). Unfortunately, since this there is no logical connection between the points, it's impossible to tell visually where these points lie in the 3D space.</p>
  
  <p><img src="https://i.stack.imgur.com/Ujlkb.png" alt="Original graph"></p>
  
  <p>The way I would prefer to remedy this is to add vertical lines on the Z axis down to the Z = 0 floor plane, something like the following blue lines (color irrelevant) which I slapped on with MS Paint to illustrate what I want:</p>
  
  <p><img src="https://i.stack.imgur.com/rf4wM.png" alt="Same graph with vertical lines added"></p>
  
  <p>This way it's easy to see, for example, that A is higher than B. After some searching, I haven't been able to dig up anything on how to implement this with gnuplot. I would greatly appreciate any assistance whether it's an RTFM pointer, or existing example of how to implement this type of plot.</p>