For example, like in this picture:

enter image description here

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    $\begingroup$ Related: mathematica.stackexchange.com/questions/4444/… -- Unfortunately, none of the answers does it in quite the way you show. Perhaps an answer could be adapted. $\endgroup$ – Michael E2 Jul 12 '16 at 4:50
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    $\begingroup$ I'd be willing to adapt my answer in the thread linked by @MichaelE2 if you provide the Mathematica code to generate the figures (without the labels). $\endgroup$ – Jens Jul 12 '16 at 4:59
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    $\begingroup$ This could also be a possible duplicate of How to automatically have ContourLabels in middle of Contour lines if specific levels are not specified?. Depends on how the plots are generated. As it stands, the question needs more information. $\endgroup$ – Jens Jul 12 '16 at 5:01
  • $\begingroup$ Maybe even closer to what the OP wants: mathematica.stackexchange.com/a/20801/41016 $\endgroup$ – Young Jul 12 '16 at 5:10
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    $\begingroup$ David, it seems that there are already quite a few questions on the subject. The specific application will depend on how your plot is drawn, and since you did not include code a specific answer likely cannot be given. I am therefore going to close this question until you edit it to either include code or differentiate it from existing questions (and solutions.) $\endgroup$ – Mr.Wizard Jul 12 '16 at 5:51

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