Observed (blue) and synthetic (red) C IV resonance doublet of our final model. The individual primary and secondary spectra are shown as dotted black and green lines, respectively. The sharp interstellar absorptions arise in the Galactic foreground and in the SMC, and are also modeled with their respective RV shifts. (a) COS observation (ID 2 in Table 1) (b) STIS observation (ID 3 in Table 1).