Fig. 3

Angular variables. a 1, UL prominence angle; 2, LL prominence angle; 3, stomion prominence angle. b 1, upper lip prominent angle (1) [Sn-Ls-UP °]; 2, upper lip prominent angle (2) [Ls-UP-Stm °]; 3, lower lip prominent angle (1) [Stm-LP-Li °]; 4, lateral lower lip prominent angle (2) [LP-Li-Ln °]