HR diagram of the WN4b sample with parameters from H19 and S19 (black circles), updated parameters using only corrected parallaxes from Gaia DR3 (grey circles), and parameters from modelling with PoWR^HD in this work (red). Gaia DR3 corrections are depicted by arrows from black circles to grey circles. Differences in addition to the distance corrections are illustrated with grey arrows from the grey circles to the red data points. For comparison, we also show the stars from S25 (cyan) as well as the H-ZAMS from Ekström et al. (2012) and the He-ZAMS from Langer (1989) as the grey and green dashed lines, respectively.