Ratio of SNR recovered by PRF stacking methods with different widths to the SNR of the original (3 × 5 × 5) stack across noise levels, using the toy model simulations of Section 3, which use a grid-like arrangement of sources with nonoverlapping Gaussian emission profiles. The curves and shaded areas show median and 68% interval values across 50 simulations of ratios of SNR for the stack method indicated by the line style and panel title. A horizontal line (black, dashed–dotted) marks a ratio of 1.