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In our quest to constrain the dynamical and structural properties of LocalGroup spirals from high-quality interferometric data, we have performed aneutral hydrogen survey in the direction of Messier 33. Here we present a fewpreliminary results from the survey and show the benefits of fitting the HIspectra by multiple peaks on constraining the structure of the Messier 33 disk.In particular we report on the discovery of new inner spiral-like and outerannular structures overlaying with the well-known main HI disk of Messier 33.Possible origins of the additional outer annular structure are presented.

Know (better) your neighbour: New HI structures in Messier 33 unveiled by a multiple peak analysis of high-resolution 21-cm data