Plot of the fusion reactivity (average of cross-section times relative speed of reacting nuclei) vs. temperature for three common reactions.  The average is over Maxwellian ion distributions with the appropriate temperature.  The plot was made with scientific Python tools using data from the NRL Plasma Formulary, 2006 revision.
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CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>