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The authors assume a constant Star Formation Rate (0-12Gyr) and a time independent IMF \cite{kroupa_variation_2001} . The metallicity parameter [Fe/H] is constant for the duration of a BSE code run (i.e. it is age-independent and uniform) so the authors combined several runs with different upper and lower IMF limits in order to mimic the observed [Fe/H] distributions.   % paragraph sfr_imf_and_z (end)  \paragraph{$f(a, \paragraph{Binary parameters $f(a,  q, e)$} \label{par:_f_a_q_e_}  For the binary runs the authors make simplifying first assumption that the function $f(a,q,e)$ is separable and assign 3 independent functions to $f(a)$, $f(q)$ and $f(e)$ respectively.