Figure 5A. Offset-limited fold plot for Narrow-Azimuth Design A. Figures 5A, 5B, 5C, and 5D show a magnified portion of the fold plot that results when source-to-detector offsets are limited to 0 to 5000 feet. Individual cells or subsurface bins are delineated as squares. Trace count in any given cell is indicated by both the color and number within each square. Offset-limited fold for this design is much higher than designs B or C, and ranges from 10 to 14.