Contributions to the dust opacity for grains of different radii a, at different distances from the accreting star indicated at each curve in AU. The opacity contribution is given in cm⁻¹, per logarithmic interval in a. The dominating contribution from grains on the order of a = a_max in size, cf. Eq. (9), is seen in the inner regions, and is enhanced by the convergence of the flow, while at greater distances from the star the more numerous smaller grains contribute more, as a result of their initial motion inwards due to the starting condition v(r_out)=v_ff. The curves have been smoothed by a filter with a width of 5 × 10⁻⁶ cm, to compensate for fluctuations due to the stochastic nature of the method used.