TRTCalibrator::BDchip Node1 TRTCalibrator::BDchip Node2 std::map< std::string, TRTCalibrator::BDstraw > Node2->Node1 +c Node3 std::string Node3->Node2 +keys Node6 std::map< std::string, TRTCalibrator::BDzero > Node3->Node6 +keys Node4 std::basic_string< char > Node4->Node3 Node5 TRTCalibrator::BDstraw Node5->Node2 +elements Node6->Node5 +s Node7 TRTCalibrator::BDzero + z Node7->Node6 +elements