Comment on: `What Determines the Static Force Chains in Stressed   Granular Media?'
  Comment on O. Gendelman, Y. G. Pollack, I. Procaccia, S. Sengupta, and J. Zylberg, Physical Review Letters 116, 078001 (2016). 
E. DeGiuli and J. N. McElwaine
cond-mat.soft