Influence of velocity law and ionization fraction of P v on profiles of the P v resonance doublet. Profiles were calculated with d = 0.2, r_cl = 1, m = 0.1, and L₀ = 0.5 for the case of HD 14947. Upper panel: comparison of profiles of the P v doublet for standard β-law (the dotted red line) and double-β law (solid black line). Lower panel: comparison of profiles of the P v doublet for constant ionization fraction q_P v = 1 (the dotted red line) and ionization fraction following from the double-β law (the thick solid black line). The thin solid blue line is the observed spectrum.