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The purpose of the study reported in this paper is to assemble as much information as possible about the behaviour of vortex structures, in particular at very low incidences, but also, briefly, at median and high incidences on the upper surface of pointed gothic wings of different apex angles. The results highlight the starting point and subsequent progressive development of large vortex structures which, at mean incidences, will become concentrated and stable but undergo transformation from structures of a flow with raised edges to those with the standard vortex tube behavioral properties.