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AGSO marine seismic data formats adhere to standards from Barry et al. (1975). The description details header mnemonics, trace header variations for unstacked data, and the transition from pseudo shot point numbers (SPN) to processing shot numbers (SHOT) after 1993. Some data sets may include bathymetry, magnetics, and gravity data.
For data released prior to 1993, a pseudo shot point number (SPN) was used, which has no direct relationship to original field shot numbers.