Comparison of predicted P v ionization fractions (blue dots) with ionization fractions derived from observations (Massa et al. 2003, crosses) at the point where the wind velocity is equal to half of its terminal value for LMC stars as a function of stellar effective temperature. The ionization fractions derived from observations were scaled by the ratio of mass-loss rate used to derive the observational fractions and our predicted mass-loss rate for LMC metallicity.