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  • Please tell me the \coordinate command that is artificially making the diagram bigger than it is. I thought that I changed all the \path commands to \draw commands. I didn't see anything that placed points or lines more than a few millimeters above the arrowhead for line t. Commented Nov 30, 2015 at 22:52
  • I see where you used pgfinterruptboundingbox. It does not surround the code for the traversals s and t. I guess that you are saying the code that introduces the artificial white vertical spacing comes from my commands for drawing line k. Commented Nov 30, 2015 at 23:02
  • @user74973 (Well, paths, not specifically a \coordinate.) Just look at what's inside the pgfinterruptboundingbox environment ... There are five \path commands, the one named line_k is the one that goes the farthest up, while line_ell goes the farthest to the right, and line_m the farthes to the left. Commented Nov 30, 2015 at 23:02
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    @user74973 Change the five \paths in the pgfinterruptboundingbox to \draw, and you'll see quite clearly where most of the space comes from. Commented Nov 30, 2015 at 23:03
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    @user74973 And the extra space at the bottom comes from path_for_the_lower_arrowhead_of_s. Commented Nov 30, 2015 at 23:05