Same as in Fig. 1 for NGC 2617. We show ${\overline{{\sigma }^2}}_{\mathrm{XVobs}}$ with T_max = 6 and 13 days with red triangle and black circle markers, respectively. We show the best-fit model variance for T_max = 6 and 13 days with red and blue lines, respectively. The M2 variance is lower than the adjacent W1 and W2 variances for the same reason explained in Fig. 1. The slope of the best-fit dashed black line is b = 0.7 ± 0.8. The vertical dashed line indicates λ = 6000 Å. Grey points and solid black line as in Fig. 1.