Cfrgtkky

I used the following Latex source file:

RequirePackage{lineno}   

documentclass[aps,prl]{revtex4}

usepackage{graphicx}% Include figure files   

usepackage{epstopdf}   % this graphic package converts eps to pdf for easier usage of eps files  

usepackage{lpic}  

usepackage{amsmath,amssymb}

usepackage{nicefrac}

usepackage[utf8]{inputenc}

usepackage{hyperref}   

usepackage{xcolor} 

usepackage{listingsutf8}  

usepackage[section]{placeins}  

lstset{mathescape=true} 

newcommand{ket}[1]{left|{#1}rightrangle} 

newcommand{bra}[1]{leftlangle{#1}right|} 

newcommand{is}[1]{{color{blue} #1}}

usepackage{subcaption}



captionsetup{compatibility=false}  

begin{document}



textbf{Corresponding author information}\

Ad van der Ven, email: a.vanderven@pwo.ru.nl



begin{figure}



  begin{subfigure}{0.50textwidth}



{bf Figure}



  caption{Based on the observed data sets}



  label{fig:RegressionFixedObservedN4451}



end{subfigure}



captionsetup{justification=raggedright,singlelinecheck=false}



caption{Regression plot for the fixed condition of the ACT (N = 445). The

 x-axis represents the natural logarithm of the absolute value of the minimum

 residual score belonging to the sequence of 14 consecutive bars with the

 smallest MSE. The y-axis represents the smallest MSE. The top line is the

 line $y = 2x + ln{10}$. The bottom line is the line $y = 2x-ln{10}$. The

 line exactly in between is the line $y=2x$.}

label{fig:observedfixedcondion}



end{figure}



end{document}

However I do not want to have justification=raggedright nor justification=raggedleft. I simply want the caption aligned left and right. It seems justification does not have that option. I could not find an answer at 'Questions that may already have your answer'.

Use

[...]

usepackage{ragged2e}

usepackage{subcaption}   

DeclareCaptionJustification{justified}{justifying}

captionsetup{compatibility=false,justification=justified}  

[...]

The formatting (line-centered caption) arises from the revtex4 document class. Here, I create my own caption justification option with DeclareCaptionJustification{myjust}{fulljustify}.

I defined fulljustify by starting with the caption package definition of centerlast and modifying it to get rid of the centered last line.

The option justification=justified, which would normally work in other document classes, is actually a null option, adding zero additional code, thus assuming the document class default is fully justified (which it is not for revtex4).

RequirePackage{lineno}

documentclass[aps,prl]{revtex4}

usepackage{graphicx}% Include figure files

usepackage{epstopdf}   % this graphic package converts eps to pdf for easier usage of eps files

usepackage{lpic}

usepackage{amsmath,amssymb}

usepackage{nicefrac}

usepackage[utf8]{inputenc}

usepackage{hyperref}

usepackage{xcolor}

usepackage{listingsutf8}

usepackage[section]{placeins}

lstset{mathescape=true}

newcommand{ket}[1]{left|{#1}rightrangle}

newcommand{bra}[1]{leftlangle{#1}right|}

newcommand{is}[1]{{color{blue} #1}}

usepackage{subcaption}

captionsetup{compatibility=false}

DeclareCaptionJustification{myjust}{fulljustify}



makeatletter

providecommandfulljustify{%

  let\@centercr

  leftskipz@%

  rightskipz@%

  parfillskipz@@plus 1fillrelax%

}

makeatother



begin{document}

textbf{Corresponding author information}\

Ad van der Ven, email: a.vanderven@pwo.ru.nl

begin{figure}

  begin{subfigure}{0.50textwidth}

{bf Figure}

  caption{Based on the observed data sets}

  label{fig:RegressionFixedObservedN4451}

end{subfigure}

captionsetup{justification=myjust,singlelinecheck=false}

caption{Regression plot for the fixed condition of the ACT (N = 445). The

 x-axis represents the natural logarithm of the absolute value of the minimum

 residual score belonging to the sequence of 14 consecutive bars with the

 smallest MSE. The y-axis represents the smallest MSE. The top line is the

 line $y = 2x + ln{10}$. The bottom line is the line $y = 2x-ln{10}$. The

 line exactly in between is the line $y=2x$.}

label{fig:observedfixedcondion}

end{figure}

end{document}