Analysis::CalibrationDataInterfaceROOT::HadronisationReferenceHelper Node1 Analysis::CalibrationData InterfaceROOT::HadronisationReference Helper + HadronisationReferenceHelper() + HadronisationReferenceHelper() + getReference() Node2 std::map< std::string, std::string > Node2->Node1 -m_refs Node3 std::string Node3->Node2 +elements +keys Node4 std::basic_string< char > Node4->Node3