Reconstructed SVD profile originating from all 929 spectral lines (left). The reconstruction is performed with all eigenprofiles. The “quasi-noise” level introduced by the line blends has a median absolute deviation (MAD) of 1.56 × 10^-5. On the right, reconstructed SVD profile with only one eigenprofile corresponding to the largest eigenvalue. The difference between the reconstruction using the full set of eigenprofiles is hardly visible and the rms between them is 2.22 × 10^-5.