Captions of floats (figures and tables) in LaTeX are by default typeset the same way as the body text. For better readability it could be appropriate to use a different font, font size or margin for the captions. This is possible with the LaTeX package caption.
For example, with the following addition to the document preamble:
\usepackage[font=sf, labelfont={sf,bf}, margin=1cm]{caption}
captions will look like in this example:
Note the sans serif font of the caption (font=sf), the bold weight of label (labelfont={sf,bf}) and the bigger margin (margin=1cm).
More information in the documentation of the caption package.
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