Comparison of cumulative SKs for the surface rotation rate, Ω_surf, as a function of radius. The results obtained with the eMOLA and the MOLA inversions are shown with red and light red lines, respectively. The dotted grey line indicates the base of the convective envelope. The black line shows the cumulative SK for the surface rotation obtained with the LSA method. The construction of the SKs by applying the LSA is described in Sect. 5. The test model described at the beginning of Sect. 3 has been used for the computation of the synthetic data.