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Hard and soft tissue landmarks and reference lines for tracing cephalograms. N nasion, S sella, A point A, B point B, L1 lower incisor, U1 upper incisor, Gn gnathion, Pg pogonion, ANS anterior nasal spine, Pn pronasale, Sn subnasale, Ls labrale superius, Li labrale inferius, Si labiomental sulcus, Pg′ soft tissue pogonion, RF HOR horizontal reference line, RF VER vertical reference line
