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Dependence of the two GA optimization criteria on the value of the weighting factor w. The convergence time (blue diamonds, left y-axis) and final SHG intensity (red squares, right y-axis) are shown as a function of w for an initial separation distance of 6.3 ± 0.8 pixels (1.9 ± 0.2 μm). The optimum value for w appears to be around 0.55.
