$V_{max}$ selection are indicated by dashed curves in Fig. \[narrow\_ratio\_cumu\_dist\]. We give numerical results for various percentile points of these distributions in Table \[tb\_a200\_vra\], and repeat all these in Table \[tb\_a200\] for samples where the separation velocity requirement has been loosened to $V_{ra}
< 0$.

![Normalised histograms of $A_{200}$, the ratio of true mass to Timing Argument estimate, for samples of Local Group analogues with $200{{\rm \,km\,s^{-1}}}\le V_{max} < 250{{\rm \,km\,s^{-1}}}$ and $-195{{\rm \,km\,s^{-1}}}<V_{ra} < -65{{\rm \,km\,s^{-1}}}$. The black histogram refers to our preferred selection where both isolation and morphology requirements are imposed. For the red histogram the isolation requirement has been removed, for the green histogram the morphology requirement, and for the blue histogram both requirements.[]{data-label="hist"}](narrow_radial_a200_hist.ps){width="50.00000%"}

![Cumulative distributions of $A_{200}$ the ratio of true mass to Timing Argument estimate for Local Group analogues with $-195{{\rm \,km\,s^{-1}}}<
V_{ra} < -65{{\rm \,km\,s^{-1}}}$. The solid curves correspond to the four samples already plotted in Fig. \[hist\] while the dashed curves are for samples with $150{{\rm \,km\,s^{-1}}}\le V_{max} < 300{{\rm \,km\,s^{-1}}}$. The colour coding is the same as in Fig. \[hist\]; black indicates samples with our preferred isolation and morphology constraints.[]{data-label="narrow_ratio_cumu_dist"}](radial_a200_cumuhist.ps){width=".5\textwidth"}

The first and most important point to note from these these figures 