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Imaging depth limit zl (SBR = 1) as a function of the sparsity factor s. (a) zl versus s in 2PM and ND-2PM for g = 0.9, 0.95, 0.99. (b) zl versus s in 2PM, NA = 0.6; 2PM, objective underfilled, NA = 0.3; ND-2PM with objective NA = 0.6, NAbeam = 0.3. Other parameters are the same as in Fig. 3.
