Comparison between the spatial distribution of grain charges and sulfur cation in a molecular cloud with similar physical conditions to Taurus. Left: abundance of S⁺ as a function of the visual extinction assuming the physical parameters derived in this work for Taurus (χ_UV = 5, , Τ = 15 Κ, t = 0.1 Myr). Vertical lines indicate A_V= 1.5, 3.5, and 5.5 mag. The horizontal blue line shows X(S⁺) = 10⁻⁷. Two values of density are considered, n_H = 3.16 × 10³ cm⁻³ (black) and n_H = 3.16 × 10⁴ cm⁻³ (red), which are representative of the translucent and dense phases (Fuente et al. 2019). Right: grain charge distribution for silicates with a size of 0.1 μm at A_v = 1.5, 3.5, and 5.5 mag assuming the physical conditions described in the left panel. In these calculations we have assumed undepleted sulfur.