Figure caption replace default “:” with a space

How can I replace the usual ":" with a space in the Figure captions.

> Figure 3: Blah blah.....................


with

> Figure 3 Blah blah.....................

• Use the caption package with \captionsetup[figure]{font={normalfont},format=plain,labelsep=quad} for example. – azetina Dec 11 '13 at 19:07

Here is a MWE using the caption package and \captionsetup:

\documentclass{article}
\usepackage{caption}
\captionsetup[figure]{font={normalfont},format=plain,labelsep=space}
\usepackage{amsmath,amssymb}
\begin{document}
\begin{figure}
$X_i= \begin{cases} 0 & \text{ for } i=0\\ (X_{i-1}\oplus A_i)\cdot H & \text{ for } i=1,\dotsc,m-1 \end{cases}$
\caption{Math Thingy}
\end{figure}

\end{document}


You may also want to try quad instead of space. I may even add that there are advanced enhancements like the \DeclareCaptionLabelSeparator which enables you to declare your own space separator or symbols as you wish. See below for some samples:

\DeclareCaptionLabelSeparator{enspace}{\enspace}
\DeclareCaptionLabelSeparator{oneem}{\hskip1em}


And used as:

\captionsetup[figure]{font={normalfont},format=plain,labelsep=enspace}
\captionsetup[figure]{font={normalfont},format=plain,labelsep=oneem}


Just for fun and to illustrate other symbolic implementation:

\DeclareCaptionLabelSeparator{triangle}{%
\,\raisebox{0.375ex}{$\scriptstyle\blacktriangleright$}~}


and is used as above