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Fig. 6

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Systematic offset in the fitted velocity dispersion for radial velocity data generated using the Kiminki & Kobulnicky (2012) binary orbital parameter distribution and fitted assuming the Sana et al. (2012) binary orbital parameter distribution, plotted against the baseline between two epochs of observations. As the baseline between the two epochs of observations increases, more spectroscopic binaries are detected, leading to a decrease in the systematic offset of the velocity dispersion. We show the results from Monte Carlo simulations for clusters with a velocity dispersion of 2 km   s-1 (upper panel) and 6 km   s-1 (lower panel), as well as for measurement uncertainties of 0.1 km   s-1 (solid), 0.5 km   s-1 (dashed), and 1 km   s-1 (dotted).

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