Alignment functions of the best fits presented in Fig. 7 and Sect. 6.3. The colour scheme is the same as in Fig. 7. Models normalised to the ratio of Lenz et al. (2017) are shown by magenta and orange lines for p_V/E(B − V) = 9% and 13%, respectively. Both models are for pro-lates with e = 2. Those normalised to the ratio of Bohlin et al. (1978) are shown by green and blue lines for p_V/E(B − V) = 9% and 13%, respectively. The model plotted in green is for oblates with e = 1.3 and the one in blue for prolates with e = 2.