[texhax] \overline and \phantom

Paul Stanley paulrichardstanley at gmail.com
Wed Aug 1 15:57:31 CEST 2012

 > something like that, basically \phantom{...} takes up the same space as
 > ... would
 > there are two variants as well, \vphantom who give the same height and
 > depth, but no width, and \hphantom, that provide width but no depth or
 > height.
 > Note that none of the phantoms print their argument
 > At the other end there is \smash, which is like \hphantom, but it also
 > prints its argument

Could you provide examples of where `\vphantom' and `\hphantom' could be used?
I can only picture two dimensions on the page, height and width, 
where does the depth fit into this?
Finally, where would smash be used?

Many thanks,

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