From the stress response function (back) to the sand pile “dip”A. P. F. Atman, P. Brunet, J. Geng, G. Reydellet, P. Claudin, R. P. Behringer and E. ClémentEur. Phys. J. E, 17 1 (2005) 93-100DOI: https://doi.org/10.1140/epje/i2005-10002-2