Figure 3. Three-D chair views showing an inline vertical slice through a 3-D volume intersecting (a) most-positive amplitude curvature (long-wavelength), (b) most-positive structural curvature (long-wavelength), (c) most-positive amplitude curvature (short-wavelength) and (d) most-positive structural curvature (short-wavelength). Notice the higher level of detail on amplitude curvature displays (a and c) compared with that on structural-curvature displays (b and d).