Panel B shows the depth of the dipolar contribution to ln γ ± versus its exponent for the different 1:1 to 3:2 electrolytes. We display electrolytes with x Dipole h = 1, i.e where no cross-over is observed, with open markers. This class contains both, electrolytes that are well-described by the dipolar term, only, as well as special cases such as many guanidinium and sulfate salts for which quadrupolar contributions are important despite no cross-over can be observed in the dipolar term. The vertical line at λ Dipole = 0.5 marks the value corresponding to the Debye-Hückel (DH) law. Electrolytes with large D Dipole show in general exponents close to the DH-value. A comparison to panels A and C shows that D Dipole is determined by both, the strength of the electrolyte and the limiting concentration where higher order terms become more important. A larger exponent indicates an increased importance of thermal averaging effects (remember that thermal averaging changes the 1/R 3 -interaction of close dipoles to a 1/R 6 -dependency, when the effective interaction strength is much smaller than kT ).