2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/116600In this paper we clarify the relationship between ribbon surfaces of Legendrian graphs and quasipositive diagrams by using certain fence diagrams. As an application, we give an alternative proof of a theorem concerning a relationship between quasipositive fiber surfaces and contact structures on the 3-sphere. We also answer a question of L. Rudolph concerning moves of quasipositive diagrams.17 pages, 19 figuresGeometric Topology57M25text