A typical cross-dipole sonic log from the study area. From left to right the five tracks are: (1) the minimum and maximum off-diagonal shear-wave energy and depth. Areas of greatest anisotropy occur where there is the greatest separation between the maximum and minimum curves (areas with a lot of green filling,376 ); (2) the gamma-ray log, well azimuth, well deviation and well diameter (caliper,376 ); (3) the azimuth of the fast shear-wave polarization; (4) the slowness of the fast and slow shear-waves and slowness-based and interval-transit-time-based percentage anisotropy (see color scale at top,376 ); (5) the fast and slow shear-waveforms for one receiver pair and the analysis window (dashed lines).