FIGURE 1. Contour map of PP13B, photograph of the LC-MSA eastern section, and the frequency of shellfish and ochre.
From the following article:
Early human use of marine resources and pigment in South Africa during the Middle Pleistocene
Curtis W. Marean, Miryam Bar-Matthews, Jocelyn Bernatchez, Erich Fisher, Paul Goldberg, Andy I. R. Herries, Zenobia Jacobs, Antonieta Jerardino, Panagiotis Karkanas, Tom Minichillo, Peter J. Nilssen, Erin Thompson, Ian Watts & Hope M. Williams
Nature 449, 905-908(18 October 2007)
doi:10.1038/nature06204
a, The number of shellfish per 50 cm 
50 cm excavated quadrant (NE, north-east quadrant, SE, south-east quadrant; N95E109, 95 metres north and 109 metres east of the zero point; for explanation of MAP grid space see Methods ) for all layers north to south. b, A geo-referenced section photograph of the eastern section with plotted ochre and shellfish on the photograph (see Supplementary Information for an un-geo-referenced version), and the main divisions of the layers indicated. c, A contour map of 13B showing the location of the LC-MSA deposits and the positions of the excavations within the MAP grid.