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{{#category_index:E|eel}} (ēl) An array of hydrophones in a separate cable. A tube containing a hydrophone group fastened to a streamer that floats on the surface or to a cable that is laid on or dragged along the sea floor. With a surface streamer, this permits the hydrophones to be deep enough in the water to improve their response and still remove them from surface noise while keeping the streamer above obstacles such as reefs or wrecks that would threaten it if it were deeper in the water or dragged along the sea floor. With a bottom cable, eels allow use of a light cable and modular replacement of arrays, and it permits the hydrophones to float above the bottom so that they have good uniform coupling.