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Using Mueller's occupancy argument together with the small-$x$ Weizs\\\"acker-Williams (WW) and dipole gluon distributions of Metz and Zhou, we find $n_{h,{\\rm DP}}^{\\rm max}=2n_g^{\\rm max}\\sim2\\alpha_s^{-3/2}$ for the dipole distribution in the same phase-space normalization. This dipole result is a process-dependent TMD proxy, not a literal gluon number density. 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