Illustration of the dependence on the extinction regime of the relationship between the normalized DIB and β. Plotted are the normalized ratios as a function of the LOS extinction, color-coded for the β value for each LOS. Marker sizes increase with target location distance to the Plane. The two estimates for β are shown (left and right). Below Av≃3 mag (left part of the graphs), decreasing ${\mathrm{D}\mathrm{I}\mathrm{B}}_{\text{norm }}^{862}$ (vertical descending lines) corresponds to an increase of β (color from red to green). Above ≃ 3 mag (right part of the graphs), there is an opposite trend: decreasing ${\mathrm{D}\mathrm{I}\mathrm{B}}_{\text{norm }}^{862}$ (again vertical descending lines) corresponds to a decrease of β (color from violet to green or cyan).