﹩\langle H^{\prime }_{\mathrm{hex}\,}( r) \rangle ﹩ averaged out of 100 samples of pseudorandom patterns. The ﹩\langle H^{\prime }_{\mathrm{hex}\,}( r) \rangle ﹩ function for the four cases is reported: the solid line represents the case of zero voids (example in Fig. 5a); other lines represent the same function for the case of voids of increasing diameter ﹩d_{v}=40﹩ (dashed line), 60 (dotted line), and 80 pixels (dot‐dashed line).