def obj2_id(self, row): return selections.h2tau_eid(row, 'e2')
def obj1_id(self, row): return selections.h2tau_eid(row, 'e1')
def obj2_id(self, row): return selections.h2tau_eid(row, 'e2')
def obj1_id(self, row): return selections.h2tau_eid(row, 'e1')