A comparison of the effect of different collision rates on the final b_n values for ﹩{T}_{e}=1000\,{\rm{K}}﹩ and ﹩{N}_{e}=100\,\mathrm{and}\,{10}^{6}\,{\mathrm{cm}}^{-3}﹩. H&S are the departure coefficients from Hummer & Storey (1987), who used Gee et al. (1976); GPLR corresponds to the use of n-changing collision rates from Gee et al. (1976), and V&S from Vriens & Smeets (1980); P&S corresponds to the use of l-changing collision rates from Pengelly & Seaton (1964), and VOS corresponds to Vrinceanu et al. (2012). The largest differences are ﹩\sim 30 \% ﹩ due to the use of different l-changing collision rates.