... approximation

Other approximations concern the treatment of line profiles, redistribution functions and microturbulence.

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...Moultaka et al. (2005)

IRS7W is their WR2 star, and not WR1 as they claim. Their WR1 star is IRS7SW.

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... lines

For that, the model spectra were convolved to take into account both the instrumental resolution and a rotational broadening represented by a simple Gaussian function.

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...$\log U = -0.6$

the ionisation parameter is defined by $U = \frac{Q_{\rm H}}{4 \pi r^{2} n c}$ where r is the distance to the ionising source (chosen to be 0.5 pc in our case) and n is the density.

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... luminosity

Our sample of WC stars is too small for a comparison to other Galactic stars to be relevant.

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