Eight local minima in the vicinity of the system in Figure 2 are shown in the red boxes. Only the last six lenses are shown, which include the four lenses of interest. The lenses with the most significant change compared to Figure 2 are marked with an arrow. For the four lenses of interest the blue bar charts show the z-values that result from theory, one negative z-value and seven equal positive z-values. When these z-values are translated into surface curvatures, the lenses in the blue boxes are obtained. For comparison, the red bar charts show the z-values obtained from data extracted from the optimized systems.