Hey, thanks for the quick replies.
Those are great suggestions. The "\**corner" family of commands is pretty close to what I want, but at the wrong height. Their angles are at the tops or bottoms of lines, when I really need them to be in the middle, unfortunately.
\rule looks like it's...
Does anyone know a way to get half-vertical lines? I mean, I'd like something identical to /vline , but which starts from the top of the row and only goes halfway down. Similarly, I'd like a line which starts from the bottom and only goes halfway up.
Even better would be something like a...