Trk::baseMagFld Node1 Trk::baseMagFld + baseMagFld() + ~baseMagFld() + getMagFld() Node2 Trk::VKalAtlasMagFld - m_VKalAthenaField - m_FIXED_ATLAS_FIELD - m_magFrameX - m_magFrameY - m_magFrameZ + VKalAtlasMagFld() + ~VKalAtlasMagFld() + getMagFld() + setAtlasField() + setAtlasField() + setAtlasMagRefFrame() Node1->Node2