Contribution of each dust component to the average extinction curve of the MW-like galaxy simulation at various times (t = 0.1, 0.5, 3.0, and 10.0 Gyr). The black thick line is the total average extinction curve, while the orange solid, green dashed, blue dotted, and light blue dash-dotted thin lines represent the contributions of silicate, graphite, PAH⁰, and PAH⁺, respectively. At t = 0.1 Gyr, the extinction curve is dominated by silicate grains across all wavelengths. However, at later times, carbonaceous grains become the dominant contributors to extinction at wavelengths longer than 2000 Å.