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FIG. T-4. 3-D surveying (a) Use of a cross-current to pull streamer off to the side; streamer positions are shown at 15 minute intervals. (b) Use of paravanes to pull marine source arrays to the side. Paravanes are also used to pull streamers to each side; sometimes as many as 12 streamers are used with two source arrays firing alternately, giving as many as 24 parallel seismic lines on one pass with the seismic ship.[1]
  1. Sheriff, R. E; Geldart, L. P (August 1995). Exploration Seismology, 2nd Ed. Cambridge Univ. Press. p. 454, 455, 456. ISBN 9780521468268.