Distributions of the average effective density, multiplied by r², reconstructed in the meridian plane of the star for a wind velocity with the form obtained from the best fit of the model described in Sect. 4. The μ-correction has not been applied. Left: radial dependence of r²ρ_eff, averaged over α and ω; middle: latitude dependence of r²ρ_eff, averaged over r and ω; right: longitude dependence of r²ρ_eff, averaged over r and α. In each panel, CO(1−0) results are shown in red and CO(2−1) results in blue. The dashed curves show the results of the model, ignoring absorption.