Illustration of how the charge per dust grain radius (q/a) [μm⁻¹ ] changes within the whole disk. For large areas of the disk, the dust is mostly neutral. In the upper areas that are largely affected by photodissociation, we find that dust charges very positively (> 100, blue contour lines). In the areas of the midplane closest to the star, we find that the dust charges very negatively (< −100, red contour lines).