A side-by-side display of seismic traces that have some acquisition parameter in common. A common-midpoint gather displays data for the same midpoint, usually after correction for normal moveout and statics. A common-offset or common-range gather displays data for the same offset for a sequence of nearby midpoints. A common-conversion point gather displays traces that have been converted from P- to S-wave upon reflection at the same point. A common-image point gather displays data that image at the same point after prestack migration.