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SAR Tomography (Tomo-SAR) is an experimental advanced coherent data combination mode allowing full 3-D imaging of volumetric and layover scatterers from a multibaseline (MB) synthetic aperture radar (SAR) data stack. However, the linear Fourier-based Tomo-SAR is generally affected by unsatisfactory imaging quality due to a typically low number of baselines with irregular spatial distribution. Recently, to improve the elevation focusing technique, a sector interpolation approach has been proposed by the authors, in which a set of uniform baseline data is recovered from the available non-uniform one by exploiting the a priori information about the extension of a height sector which contains the scatterers. In this work, first experiments are presented of sector interpolated Tomo-SAR carried out with real spaceborne MB SAR data acquired over the Cinecittà area of the city of Rome.