Table 4. Effect of the distortion of the drawing in E-W orientation of the anterior profile. A + sign means an increased concavity index; in the posterior profile the effect is opposite.

  Drawing
occ. surface
facing
M1,2
sin. ant.
M1,2
dext. ant.
  right-hand
N
+
-
  right-hand
S
-
+
  left-hand
N
-
+
  left-hand
S
+
-