Comparison between the spatial distribution of grain charges and sulfur cation in a molecular cloud with similar physical conditions to Orion. Left: Abundance of S⁺ as a function of the visual extinction assuming the physical parameters derived for Orion (χ_UV = 50, T = 25 Κ) and t = 0.1 Myr. We consider two values of density, n_H = 3.16×10⁴ cm⁻³ (black) and n_H = 3.16×10⁵ cm⁻³ (red). Continuous and dashedlines show the results for and , respectively. Vertical lines indicate A_V = 1.5, 3.5, and 5.5 mag. The horizontal blue line shows X(S⁺)=10⁻⁷. 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. Continuous black and dashed blue lines show the results for and , respectively.