Solar eigenmodes frequencies are most often determined using some kind of modelisation of the Fourier spectrum of the data in one or two dimensions. Many statistical refinements have lead to significant improvements in the determination of the frequencies and widths of the spectral lines. Nevertheless, this technique relies strongly on several

In a previous work (Eff-Darwich & Pérez-Hernández 1997), it was presented a new inversion method based on the Regularized Least Squares technique. This new method, called OMD (Optimal Mesh Distribution) finds the optimal mesh and smoothing function by means of a deep analysis of the basis functions of the inversion problem. In the present work, the

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