Standard deviation of the column density as a function of the orbital phase computed numerically (in blue) and analytically (black dots) for simulations with m_cl = 10⁻⁵, R_cl = 0.02. Top panel; β = 2, a = 2 and i = 90° and bottom panel: β = 0.5, a = 1.6 and i = 45°. The discrepancy at low orbital phase is partly indicative of the region near the stellar photosphere where the wind in the numerical model is assumed to not be clumpy yet.