1. A pattern. 2. A sheet of transparent plastic marked with statics or normal-moveout patterns; used as a guide in picking seismic events. 3. A transparent overlay for calculating gravity or magnetic effects such as a dot chart (q.v.). Templates are used for terrain correction, isostatic correction, or residualizing. See also </a>graticule</a>, patch, and zone chart. 4. The nominal geometry (active receivers) for a single source emission. 5. A subsea assembly to space boreholes under a production platform.