Optical spectrum of the WC6 star WR 13. The solid thin line is the observed spectrum, the thick dotted line represents the best-fit WC grid model. The primary model parameters are T_∗ = 79.4   kK and log R_t/R_⊙ = 0.5. The same model fits to most of the Galactic WC6 single stars, although it tends to underestimate the peak heights of C iv 5808 Å and the C iii/C iv blend around 4650 Å.