FPTracker::EmptySpaceElement Node1 FPTracker::EmptySpaceElement - m_frontFace - m_rearFace - m_signedLength - m_absLength - m_pos - m_label - m_side + EmptySpaceElement() + EmptySpaceElement() + clone() + ~EmptySpaceElement() + frontFace() + rearFace() + zabspos() + zsignedpos() + position() + side() + isEndElement() + str() + label() + track() + calibrate() Node2 FPTracker::IBeamElement + ~IBeamElement() + frontFace() + rearFace() + zsignedpos() + zabspos() + position() + side() + label() + isEndElement() + track() + calibrate() + str() + clone() Node2->Node1