operating a marine surveying system in a survey area, wherein the surveying system comprises a plurality of sources in a wide-tow source geometry having a plurality of source separations, and a plurality of streamers that comprise a plurality of receivers, the plurality of streamers having a plurality of streamer separations, and wherein the plurality of sources and the plurality of streamers are towed by a single vessel such that a crossline distance between outermost ones of the sources is less than a crossline distance between outermost ones of the streamers;

during each of a plurality of sail lines traversed by the surveying system, actuating at least one of the plurality of sources to create a signal and detecting the signal with at least a first receiver of the plurality of receivers, wherein each of the sail lines generates a set of common midpoint (“CMP”) sublines, each set exhibiting a non-uniform CMP data distribution; and

reducing the non-uniformity of the CMP data distribution of at least one of the sets of CMP sublines by sailing the surveying system along at least first and second sail lines such that at least one CMP subline corresponding to the first sail line is interleaved between CMP sublines corresponding to the second sail line;

wherein the plurality of sources comprises a plurality of inner sources, wherein each adjacent pair of inner sources has an innermost source separation, and two outer sources, wherein each outer source is separated from a nearest inner source of the plurality of inner sources by an outer source separation, and the innermost source separation is smaller than the outer source separation.