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\midheading{$g(-p_1)+g(-p_2) \to \gamma(p_3)+\gamma(p_4)+f(p_5)$}
Process {\tt 2861} represents the process
$gg \to \gamma\gamma g$ mediated by a loop of light quarks.
This process is calculable at leading order LO, O($\alpha_s^3$).
The calculation is described in Ref.~\cite{Campbell:2014yka}.