{\left|\hat{Z}_{R_{j} } \left(\pi _{S} \right)\right|\mathord{\left/ {\vphantom {\left|\hat{Z}_{R_{j} } \left(\pi _{S} \right)\right| \left|B_{R_{j} } \left(\pi _{S} \right)\right|}} \right. \kern-\nulldelimiterspace} \left|B_{R_{j} } \left(\pi _{S} \right)\right|} $, w