A sand curve described 25years ago has been in continuous use by Saudi Aramco for seismic data processing in dune areas of the Rub Al-Khali. Refraction field methods behind this sand curve have many potential uncertainties. Recent laboratory data on dry sand similar to that in Saudi Arabia allows the calculation of a new sand curve for comparison. The result is a remarkable level of agreement based on two very different kinds of measurement, giving added confidence and refinement to the venerable sand curve.

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