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The need for 4D co-processing of Towed Streamer (TS) and Ocean-Bottom Node (OBN) data occurs in time-lapse projects where production infrastructure is installed between baseline and monitor surveys. kelas 4d login It can also occur early in a planned OBN time-lapse campaign where the first OBN survey uses a legacy TS exploration dataset as a baseline However, TS and OBN surveys sample the wavefield in very