 \max\left\{ {\left\Vert { {\operatorname{\mathbb{E}}}\big[ {{\bm{ZZ}}}^{*}\big] } \right\Vert}, \     {\left\Vert { {\operatorname{\mathbb{E}}}\big[ {{\bm{Z}}}^{*}{{\bm{Z}}} \big] } \right\Vert} \right\}