How can I make a hat vector character in XMGRACE? I've been trying all combinations for two hours now.
To be honest, doing something like that is annoyingly difficult in xmgrace. In this case, the most easy route would be to use a superscript and shift it to the left with the \h
command:
v\S\h{-0.6}^
which results in something like this:
It is not particularly pretty, but it does the job (I guess).
The full list of available commands can be found here.