I am trying to edit an Rtex file and I'm creating plots. I have a plot below, which does compile. However, there is an empty white space below the caption. I can't figure out how to remove it. I have tried to search for solutions but to no avail:

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  CodePudding user response：

  Your image does have quite a lot of white space around it. You can move the caption further up with this quick hack:

  \documentclass[a4paper,11pt]{article}
  
  %Packages
  \usepackage[justification=centering]{caption}
  \usepackage{blindtext}
  \begin{document}
  \title{F-distribution}
  \maketitle
  \section{Diagram showing the $F$-distribution for a selected pair of values of the degree of freedom}
  \blindtext
  \begin{figure}[h!]
  <<echo=FALSE, cache=TRUE, fig.width=5, fig.height=5>>=
  curve(df(x, df1=20, df2=20))
  @
  \vskip-1cm
  \caption{Hi}
  \end{figure}
  \blindtext
  \blindtext
  \end{document}