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I am writing a PhD thesis. Sometimes when I reference to a figure the following problem occurs. In PDF the word Fig.[number of figure] are written in two lines (Fig. and [] are separated). How to write the code that it will not be separated.

my code for figure:

\caption{The dielectric permittivity bla bla bla.}
\end {figure}

in text it is like

At the end of this chapter let us compare the numerical results for the phase mode frequency and dielectric response with experimental results. Fig. \ref{(4)13} shows the relaxation frequency ($\omega$) bla bla bla...

And in the PDF looks like:

enter image description here

Thank you very much for your help.

Best regards, Kristina

marked as duplicate by David Carlisle floats Jan 13 '16 at 16:58

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