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\paragraph{SFR, IMF and z}  \label{par:sfr_imf_and_z}  The authors assume a constant Star Formation Rate (0-12Gyr) and a time independent IMF \cite{kroupa_variation_2001} . Because the The  metallicity parameterfor  [Fe/H]in the BSE code  is constant for the duration of the 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{$f(a, q, e)$}