“…In the figure, we plot the optimized backhaul rate from (5) (solid lines) as a function of the density λ for F = 200 files, α = 0.7, r u = 60 meters, different cache size constraint M , and T = 2. For comparison, we also plot the curves for popular content placement, i.e., with µ max = µ min = 1 in (5) (dashed lines), and the optimal backhaul rate of the protocol from [12] (dotted lines). Note that if the protocols give a backhaul rate above one, we plot one, since a backhaul rate of one can be obtained by downloading the file directly from the MBS.…”