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Phase unwrapping in the kz-angle domain can be used to evaluate the delay of angle gathers, a preliminary step towards velocity analysis. Simple numerical test indicates that some limitations that come from angle sampling or illumination can be overcome by considering jointly a number of gathers from the same horizon. The application of this unwrapping technique may require more investigation about image windowing (which should ideally follow the still-unknown gather curvature) and gather picking to ensure phase continuity.