mc_weight_type Accept() { 
  Config.DT.confirm_insertTwoOperators();
  det->accept_move(); 
  if (Config.RecordStatisticConfigurations) {
   HISTO_Length_Kinks_Accepted << deltaTau;
  }
  Config.update_Sign();
  return Config.ratioNewSign_OldSign();
 }
 mc_weight_type Accept() { 
  Config.DT.confirm_removeTwoOperators(); 
  det->accept_move(); 
  Config.update_Sign();
  return Config.ratioNewSign_OldSign();
 }