ΔE∕E calculated for varying radii for all systems. Two groups can be identified, those falling bellow ΔE∕E = 1, which includes V471 Tau (light green) and DP Leo (black), and those above including HW Vir (dark green) and NN Ser (red). Between the gap is RX J2130.6+4710 (dark blue). See also Table 1 to relate the key legends with specific systems. At the borders the solutions for the Applegate energy become imaginary (see Völschow et al. 2016 for a discussion on this).