# How can I change figure caption label?

I am using `revtex4-1` for a Physical Review Letter. Typically when a figure is made, the caption starts out `FIG. 1. <text>`. I am creating a supplementary file and I would like it to say `FIG. S1. <text>`. How can I change that?

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have you seen how-to-change-the-numbering-for-different-figures – cmhughes Feb 10 '12 at 16:32

A global modification to `\thefigure` of the form

``````\renewcommand{\thefigure}{S\arabic{figure}}
``````

would suffice (in your document preamble). Alternatively, if you only want to modify the figure number representation in the caption only (since you might not be referencing it as part of "supplementary figures"), you could use

``````\makeatletter
\renewcommand{\fnum@figure}{\figurename~S\thefigure}
\makeatother
``````

The former is preferred, since it makes more sense.

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@SofiaMouseti Please ask a new question. – egreg May 7 '15 at 9:02