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Now your code works! Probably, I missed something when inserting it. Anyway, I have prepared an MWE and would put it on display -- it could be useful to others...

\documentclass[twoside,rmp, ams]{revtex4-1}
\usepackage{amsmath, amsfonts, amssymb}
\usepackage{graphicx}

%%%%%%%%%%%%%%%%% Clemens ...

Thanks, Clemens -- but I was unable to get the result using the code, even after numerous attempts.

\makeatletter
\renewcommand\@make@capt@title[2]{%
\@ifx@empty\float@link{\@firstofone}{\expandafter\href\expandafter{\float@link}}%
{\textbf{#1}}\@caption@fignum@sep#2\quad}%
\makeatother ...

Hi,

How can I change the justification from centered to justified in figure captions?

Document class I use: revtex4-1
Tex Live for Mac

Revtex4-1 does not support the caption package I am using, and the \usepackage command is of no use: justification does change from the original \centered to ...