Figure 4. Examples of hybrid-erasure architecture. (a) \(\mathcal{A}(5,0.6,P_r)\) where the placement \(P_r = \{1,2,5,...,22\}\) is sampled at random. (b) \(\mathcal{A}(7,0.57,P^*)\). Since \(f_e\times d^2 = 27.93\), only 27 erasures are allocated, with $24$ erasures placed in 2 rows/columns, and the remaining 3 placed greedily, all as close to the center as possible.