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\section{Scale Heights}  \paragraph{Parameters - SFR, IMF and z}  The authors assume In general, most stars in spiral disk galaxies orbit within  a constant Star Formation Rate (0-12Gyr) and 2D plane. However disk stars also have  a time independent IMF as per \cite{kroupa} . component of their orbits in the vertical direction.  The metallicity parameter [Fe/H] must population of disk stars that show a distribution of vertical heights can  be held constant for characterized by a scale height, \emph{h}. For any single scale height,  the duration probability  of finding  a BSE code run (i.e. it is age-independent and uniform) so star at a given height z above  the authors combined several runs with different upper and lower IMF limits in order disk is proportional  to mimic the observed [Fe/H] distributions.   \paragraph{Parameters - orbit-sizes, mass-ratios, eccentricities}  \label{par:_f_a_q_e_}  For the BSE software runs, the authors made exp(-z/h). If a galaxy is characterized by  a simplifying assumption \emph{bimodal} distribution of scale heights, this implies  that the function $f(a,q,e)$ galaxy  is separable and they assigned various analytic formulae to each of: $f(a)$ - initial orbit-sizes, $f(q)$ - initial mass ratios and $f(e)$ - initial eccentricities.  \paragraph{}  All parameters for the BSE code were kept at their default values and in order to handle brown dwarfs with really composed of two different kinds of disks:  a mass below $0.08 M_{\odot}$ the authors used an extra data grid from Baraffe et al. (1998).  \paragraph{}  For orbital periods above 5 years, each binary component was evolved separately thick disk  and a binary was made from two single-star models (S+S) using approximations given by Hurley thin disk. It is this fact that Bovy  et al. (2000).  \paragraph{}  The authors used this parallel S+S approximation as a check on the full BSE models and found the S+S approach gave a roughly similar a-distribution but slightly more short-period pairs then the more detailed BSE calculations. are arguing against.