Figure 3. Segment of a seismic section (crossline) through (a) the input seismic volume after median filtering, and (b) the equivalent section through the cosine of instantaneous phase attribute. The prominent horizon in yellow was autotracked on the blue trough and is shown on both sections. The zero-crossing at the location of the black arrows and the peak at the location of the cyan arrows cannot be successfully autotracked. In contrast, autotracking works well for these horizons on the cosine of instantaneous phase attribute shown in (d) and then overlaid on the seismic shown in (c). They seem to fit perfectly.