\begin{figure*}[hbt]

\ifnextchar[{\eatarg}{}

\includegraphics[width=1\linewidth]{example_files/figure-latex/penguinimage-1} \caption{Flipper length and body mass for Adelie, Chinstrap and Gentoo Penguins.}\label{fig:penguinimage}

\end{figure*}

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\begin{figure*}[hbt]

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{\centering \subfloat[Penguin bill length negatively correlates with penguin bill depth\label{fig:morepenguins-1}]{\includegraphics[width=0.5\linewidth]{example_files/figure-latex/morepenguins-1} }\subfloat[Penguin bill length positively correlates with body mass\label{fig:morepenguins-2}]{\includegraphics[width=0.5\linewidth]{example_files/figure-latex/morepenguins-2} }\newline\subfloat[Boxplot of penguin bill lengths by species\label{fig:morepenguins-3}]{\includegraphics[width=0.5\linewidth]{example_files/figure-latex/morepenguins-3} }

}

\caption{Different ways of looking at penguin bills. Note that this sort of multiple-figure-in-one-section plot will look best in doctypes man, doc, and stu -- and be a bit abbreviated in doctype jou.}\label{fig:morepenguins}

\end{figure*}