...
/// Save only events that are in the geometric acceptance.
SQGeomAcc* geom_acc = new SQGeomAcc();
geom_acc->SetMuonMode(SQGeomAcc::PAIR); // PAIR, PAIR_TBBT, SINGLE, SINGLE_T, etc.
geom_acc->SetPlaneMode(SQGeomAcc::HODO_CHAM); // HODO, CHAM or HODO_CHAM
geom_acc->SetNumOfH1EdgeElementsExcluded(4); // Exclude 4 elements at H1 edges
se->registerSubsystem(geom_acc);