## Indicate mean with a bar in Matlab

I want to put the following as an axis label on a plot, but I cannot figure out how to get the bar on top in Matlab
$$\bar \xi$$
Thanks.
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 Thanks for your help, but I could not get this to work because I am trying to change a .fig file in the property editor. I tried generating the code, and then making the modification there, but I was unable to save as .fig after that. Any suggestions?