The 95% lower limit on the discriminatory power, ﹩D_{95}﹩, of current surveys (solid line) and the proposed next‐generation survey, "SuperMACHO," of Stubbs (1998) as a function of observation epoch. We assume a starting date of 1992.5 for the current surveys and 2001 for SuperMACHO. The limits shown are for the halo model with ﹩f_{h}=0.1﹩ and ﹩m_{\mathrm{dark}\,}=0.5\,M_{\odot }﹩.