Split caption of a figure into two equal lines [closed] - latex

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I would like to split for example the phrase:
Lower, upper and simulation throughput per user vs number of users
which appears in a caption of figure, into two lines in order for every line to have almost equal length. Something like the following:
Lower, upper and simulation
throughput per user vs number of users
How can I do that? I would appreciate any help!

Answer 1

You could wrap the contents in a varwidth environment (from the similarly-named varwidth package) of large-enough width. varwidth will shrink it to fit that natural content:
\documentclass{article}
\usepackage{graphicx}% http://ctan.org/pkg/graphicx
\usepackage{varwidth}% http://ctan.org/pkg/varwidth
\begin{document}
\listoffigures
\begin{figure}
\centering
\includegraphics[scale=.5]{example-image-a}% Image
\caption[Lower, upper and simulation throughput per user \textit{vs.}\ number of users]
{\begin{varwidth}[t]{\linewidth}Lower, upper and simulation \\ throughput per user \textit{vs.}\ number of users\end{varwidth}}
\end{figure}
\end{document}
The reason for specifying the caption twice (once in the option argument [] and once as part of the mandatory argument {}) is because sending a box-constrained piece of text to the ToC doesn't look great. So, this separates the formatting between the two document components. Depending on the document class you're using, it is also possible to make this part of the regular label-setting requirements.
The caption package also provides format=hang with justification=raggedright that seems to duplicate your requirement. However, you'll have to play with the margins to adequately obtain the output you're after.