Velocity stratification υ(r) comparison of the best-fit WN4b β = 1 grid model (H19, black connected circles) and the PoWR^HD models in this work (red connected circles) of WR1. The υ(r) of the remaining five targets in this work are shown in cyan for comparison. The range of photospheric radii of the PoWR^HD models at optical depth τ = 2/3 R_2/3 is shaded in grey. The difference in outermost radii between the grid models and the PoWR^HD models is due to the former being traditionally modelled up to 1000 R_⊙ and the latter up to 50 000 R_*.