Left: mass-loss rates and wind velocities of models with phase shift at the inner boundary (circles), the original model (orange star) and observations (crosses). The dark grey area is the standard deviation σ of the mass-loss rates of the observations, and the light grey is 2σ. Right: each square represent a model; Δφ_s, Δφ_p and Δφ_tot indicated. The colours are the same as in the left panel; models <1σ in the mass-loss rate and velocity plot are in light green.