Lo: lateral orbitale, horizontal plane (Lo-Lo line), z-axis (red line): midsagittal line perpendicular to Lo-Lo line, Me: menton, MeS: soft tissue of Me, R line (bone plane: R0-R3 line), M line (muscular plane: M0-M3 line), and S line (skin plane: S0-S3 line). CSI: chin skin inferior, CBI: chin bone inferior, CSS: chin skin superior, and CBS: chin bone superior. Green lines (distances): R line, M line, and S line at level 0 to level 3. Yellow double arrow (angles): A: Or-ramus angle, B: Or-muscle angle, and C: Or-skin angle. Pink arrow (angles): D: jaw angle (angle between R line and CBS-CBI line), E: face angle (angle between S line and CSS-CSI line).