Sonic-point conditions for our sample of putatively single WC/WO stars in the Galaxy and LMC. Density and temperature at the sonic point are expressed in terms of gas and radiation pressure Pgas and Prad. Blue crosses indicate results from our empirical analysis in Sect. 4.1, black dots indicate estimates based on β-type wind models from Sect. 4.2. Both methods indicate a sonic-point relation with Prad/Pgas = const. Uncertainties for the semi-empirically determined data points are discussed in Sect. 5.3. For the ratio of Prad/Pgas they are likely of the order of 0.3 dex, but may be higher for individual positions along the indicated relations.
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